DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.3) [L.H.D. (E)]

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Caution

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

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.

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