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