DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.3) [R.H.D.]

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Caution

•  Perform the following malfunction diagnosis only when it is diagnosed with a short to power supply by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

Warning

<<High voltage>>

•  Always observe the following thoroughly to ensure safety when inspecting or removing/installing parts in the motor compartment. Otherwise, the high voltage circuit may operate on the vehicle regardless of whether or not the main power is switched OFF or ON (READY off or on). If this occurs, it could cause electrical shock and result in serious injury or, in the worst case, death.

―  Do not select high voltage battery cooling on center display after EV system stops

―  Do not open/close doors frequently with main power switched OFF

―  Do not perform normal charging or quick charging

―  Switch to connected vehicle maintenance mode (MyMazda App connected vehicle)

―  Cancel climate control timer

―  Operate center display and turn off battery heater operation

Warning

•  The cooling fan may suddenly start operating regardless of the main power switch position. Keep hands and tools away from the cooling fan even if the cooling fan is not operating to prevent injury, or damage to the cooling fan. When servicing the cooling fan or parts near the cooling fan, ensure the following.

―  Do not perform normal charging or quick charging

―  Do not select high voltage battery cooling on center display after EV system stops

―  Do not open/close doors frequently with main power switched OFF

―  Switch to connected vehicle maintenance mode (MyMazda App connected vehicle)

―  Cancel climate control timer

―  Operate center display and turn off battery heater operation

System Wiring Diagram

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Determination Procedure

Caution

•  When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.

•  When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.

•  Disconnect the negative lead-acid battery terminal before performing any work that requires handling of connectors.

Step	Inspection		Action
1	INSPECT CAN LINE BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTOR C-31 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-31. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 3.
		No	Go to the next step.
2	INSPECT BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector 2 which has body control module (BCM) terminals 2L and 2J. •  Connect the connector C-31. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J (wiring harness side). •  Is the voltage between 1.5—3.5 V?	Yes	Replace the body control module (BCM) because there is a short to the power supply in the body control module (BCM). (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the body control module (BCM) and connector C-31 because the wiring harness is shorted to the power supply.
3	INSPECT CAN LINE BETWEEN FRONT COMBINATION LIGHT (LH) AND CONNECTOR C-31 FOR SHORT TO POWER SUPPLY •  Measure the voltage at front combination light (LH) terminals D and E. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 5.
		No	Go to the next step.
4	INSPECT FRONT COMBINATION LIGHT (LH) FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the front combination light (LH) connector. •  Connect the connector C-31. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the front combination light (LH) because there is a short to the power supply in the front combination light (LH). (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the front combination light (LH) and connector C-31 because the wiring harness is shorted to the power supply.
5	INSPECT CAN LINE BETWEEN CONNECTOR C-33 AND CONNECTOR C-31 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-33. •  Connect the connector C-31. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connector C-33 and connector C-31 because the wiring harness is shorted to the power supply.
6	INSPECT CAN LINE BETWEEN FRONT COMBINATION LIGHT (RH) AND CONNECTOR C-33 FOR SHORT TO POWER SUPPLY •  Measure the voltage at front combination light (RH) terminals D and E. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 8.
		No	Go to the next step.
7	INSPECT FRONT COMBINATION LIGHT (RH) FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the front combination light (RH) connector. •  Connect the connector C-33. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the front combination light (RH) because there is a short to the power supply in the front combination light (RH). (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the front combination light (RH) and connector C-33 because the wiring harness is shorted to the power supply.
8	INSPECT CAN LINE BETWEEN CONNECTOR C-34 AND CONNECTOR C-33 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-34. •  Connect the connector C-33. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connector C-34 and connector C-33 because the wiring harness is shorted to the power supply.
9	INSPECT CAN LINE BETWEEN HEAT PUMP CONTROL UNIT AND CONNECTOR C-34 FOR SHORT TO POWER SUPPLY •  Measure the voltage at heat pump control unit terminals C and E. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 11.
		No	Go to the next step.
10	INSPECT CAN LINE BETWEEN HEAT PUMP CONTROL UNIT AND CONNECTOR C-09 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-34. •  Disconnect the heat pump control unit connector. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at heat pump control unit terminals C and E. •  Is the voltage between 1.5—3.5 V?	Yes	Repair or replace the wiring harness between connector C-34 and connector C-09 because the wiring harness is shorted to the power supply.
		No	Go to the next step.
11	INSPECT HEAT PUMP CONTROL UNIT FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Connect the connector C-34. •  Connect the connector C-09. •  Connect the climate control unit connector. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the heat pump control unit because there is a short to the power supply in the heat pump control unit. (See HEAT PUMP CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
		No	Repair or replace the wiring harness between the heat pump control unit and connector C-09 because the wiring harness is shorted to the power supply.
12	INSPECT CAN LINE BETWEEN CONNECTOR C-34 AND CONNECTOR C-04 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-04. •  Connect the connector C-34. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connector C-34 and connector C-04 because the wiring harness is shorted to the power supply.
13	INSPECT CAN LINE BETWEEN CONNECTOR C-36 AND CONNECTOR C-04 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-36. •  Connect the connector C-04. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connector C-04 and connector C-36 because the wiring harness is shorted to the power supply.
14	INSPECT CAN LINE BETWEEN INSTRUMENT CLUSTER AND CONNECTOR C-36 FOR SHORT TO POWER SUPPLY •  Measure the voltage at instrument cluster terminals AK and AM. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 15.
		No	Go to the next step.
15	INSPECT INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the instrument cluster connector. •  Connect the connector C-36. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the instrument cluster because there is a short to the power supply in the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION [(E)].)
		No	Repair or replace the wiring harness between the instrument cluster and connector C-36 because the wiring harness is shorted to the power supply.
16	INSPECT CAN LINE BETWEEN CONNECTOR C-36 AND CONNECTOR C-39 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-39. •  Connect the connector C-36. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connector C-36 and connector C-39 because the wiring harness is shorted to the power supply.
17	INSPECT CAN LINE BETWEEN STEERING LOCK UNIT AND CONNECTOR C-39 FOR SHORT TO POWER SUPPLY •  Measure the voltage at steering lock unit terminals B and D. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 18.
		No	Go to the next step.
18	INSPECT STEERING LOCK UNIT FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the steering lock unit connector. •  Connect the connector C-39. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the steering lock unit because there is a short to the power supply in the steering lock unit. (See STEERING LOCK UNIT REMOVAL/INSTALLATION [(E)].)
		No	Repair or replace the wiring harness between the steering lock unit and connector C-39 because the wiring harness is shorted to the power supply.
19	INSPECT CAN LINE BETWEEN CLIMATE CONTROL UNIT AND CONNECTOR C-39 FOR SHORT TO POWER SUPPLY •  Measure the voltage at climate control unit terminals 1K and 1N. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 20.
		No	Go to the next step.
20	INSPECT CLIMATE CONTROL UNIT FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the climate control unit connector. •  Connect the connector C-39. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the climate control unit because there is a short to the power supply in the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
		No	Repair or replace the wiring harness between the climate control unit and connector C-39 because the wiring harness is shorted to the power supply.
21	INSPECT CAN LINE BETWEEN CONNECTOR C-39 AND CONNECTOR C-38 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-38. •  Connect the connector C-39. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connector C-39 and connector C-38 because the wiring harness is shorted to the power supply.
22	INSPECT CAN LINE BETWEEN STEERING ANGLE SENSOR AND CONNECTOR C-38 FOR SHORT TO POWER SUPPLY •  Measure the voltage at steering angle sensor terminals B and C. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 23.
		No	Go to the next step.
23	INSPECT STEERING ANGLE SENSOR FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the steering angle sensor connector. •  Connect the connector C-38. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the steering angle sensor because there is a short to the power supply in the steering angle sensor. (See STEERING ANGLE SENSOR REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the steering angle sensor and connector C-38 because the wiring harness is shorted to the power supply.
24	INSPECT CAN LINE BETWEEN ACTIVE DRIVING DISPLAY AND CONNECTOR C-38 FOR SHORT TO POWER SUPPLY •  Measure the voltage at active driving display terminals I and G. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 25.
		No	Go to the next step.
25	INSPECT ACTIVE DRIVING DISPLAY FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the active driving display connector. •  Connect the connector C-38. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the active driving display because there is a short to the power supply in the active driving display. (See ACTIVE DRIVING DISPLAY REMOVAL/INSTALLATION [(E)].)
		No	Repair or replace the wiring harness between the active driving display and connector C-38 because the wiring harness is shorted to the power supply.
26	INSPECT CAN LINE BETWEEN CONNECTOR C-13 AND CONNECTOR C-38 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-13. •  Connect the connector C-38. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connector C-38 and connector C-13 because the wiring harness is shorted to the power supply.
27	INSPECT CAN LINE BETWEEN CONNECTORS C-78, C-79 AND CONNECTOR C-13 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connectors C-78, C-79. •  Connect the connector C-13. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connectors C-78, C-79 and connector C-13 because the wiring harness is shorted to the power supply.
28	INSPECT CAN LINE BETWEEN DOOR-ELECTRICAL SUPPLY UNIT (DRIVER'S SIDE) AND CONNECTORS C-78, C-79 FOR SHORT TO POWER SUPPLY •  Measure the voltage at door-electrical supply unit (driver's side) terminals 1A and 1B. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 30.
		No	Go to the next step.
29	INSPECT CAN LINE BETWEEN DOOR-ELECTRICAL SUPPLY UNIT (DRIVER'S SIDE) AND CONNECTOR C-23 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-23. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at door-electrical supply unit (driver's side) terminals 1A and 1B. •  Is the voltage between 1.5—3.5 V?	Yes	Repair or replace the wiring harness between connectors C-78, C-79 and connector C-23 because the wiring harness is shorted to the power supply.
		No	Go to the next step.
30	INSPECT DOOR-ELECTRICAL SUPPLY UNIT (DRIVER'S SIDE) FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the door-electrical supply unit (driver's side) connector. •  Connect the connector C-23. •  Connect the connectors C-78, C-79. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the door-electrical supply unit (driver's side) because there is a short to the power supply in the door-electrical supply unit (driver's side). (See DOOR-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the door-electrical supply unit (driver's side) and connector C-23 because the wiring harness is shorted to the power supply.
31	INSPECT CAN LINE BETWEEN LF CONTROL UNIT AND CONNECTOR C-41 FOR SHORT TO POWER SUPPLY •  Measure the voltage at LF control unit terminals M and P. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 32.
		No	Go to the next step.
32	INSPECT LF CONTROL UNIT FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the LF control unit connector. •  Connect the connectors C-78, C-79. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the LF control unit because there is a short to the power supply in the LF control unit. (See LF CONTROL UNIT REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the LF control unit and connectors C-78, C-79 because the wiring harness is shorted to the power supply.
33	INSPECT CAN LINE BETWEEN CONNECTORS C-78, C-79 AND CONNECTOR C-40 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-40. •  Connect the connectors C-78, C-79. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connectors C-78, C-79 and connector C-40 because the wiring harness is shorted to the power supply.
34	INSPECT CAN LINE BETWEEN DASH-ELECTRICAL SUPPLY UNIT AND CONNECTOR C-40 FOR SHORT TO POWER SUPPLY •  Measure the voltage at dash-electrical supply unit terminals 1K and 1I. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 35.
		No	Go to the next step.
35	INSPECT DASH-ELECTRICAL SUPPLY UNIT FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the dash-electrical supply unit connector. •  Connect the connector C-40. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the dash-electrical supply unit because there is a short to the power supply in the dash-electrical supply unit. (See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
		No	Repair or replace the wiring harness between the dash-electrical supply unit and connector C-40 because the wiring harness is shorted to the power supply.
36	INSPECT CAN LINE BETWEEN DOOR-ELECTRICAL SUPPLY UNIT (PASSENGER'S SIDE) AND CONNECTOR C-47 FOR SHORT TO POWER SUPPLY •  Measure the voltage at door-electrical supply unit (passenger's side) terminals 1A and 1B. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 38.
		No	Go to the next step.
37	INSPECT CAN LINE BETWEEN DOOR-ELECTRICAL SUPPLY UNIT (PASSENGER'S SIDE) AND CONNECTOR C-22 FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-22. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at door-electrical supply unit (passenger's side) terminals 1A and 1B. •  Is the voltage between 1.5—3.5 V?	Yes	Repair or replace the wiring harness between connector C-40 and connector C-22 because the wiring harness is shorted to the power supply.
		No	Go to the next step.
38	INSPECT DOOR-ELECTRICAL SUPPLY UNIT (PASSENGER'S SIDE) FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the door-electrical supply unit (passenger's side) connector. •  Connect the connector C-22. •  Connect the connector C-40. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the door-electrical supply unit (passenger's side) because there is a short to the power supply in the door-electrical supply unit (passenger's side). (See DOOR-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the door-electrical supply unit (passenger's side) and connector C-22 because the wiring harness is shorted to the power supply.
39	INSPECT ELECTRICAL SUPPLY UNIT (ESU) FOR SHORT TO POWER SUPPLY •  Switch the main power OFF. •  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the electrical supply unit (ESU) connector. •  Connect the connector C-40. •  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the main power ON (READY off). •  Measure the voltage at body control module (BCM) terminals 2L and 2J. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the electrical supply unit (ESU) because there is a short to the power supply in the electrical supply unit (ESU). (See ELECTRICAL SUPPLY UNIT (ESU) REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the electrical supply unit (ESU) and connector C-40 because the wiring harness is shorted to the power supply.