DETERMINING SHORT BETWEEN CIRCUITS LOCATION (CAN-BUS No.1) [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.
•  Disconnect the connector 3 which has body control module (BCM) terminals 3X and 3W.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 3X and 3W (wiring harness side).
•  Is the voltage at body control module (BCM) terminals 3X and 3W (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).
2
INSPECT CAN LINE BETWEEN CONNECTOR C-39 AND BODY CONTROL MODULE (BCM) FOR SHORT BETWEEN CIRCUITS
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-39.
•  Connect the connector 3 which has body control module (BCM) terminals 3X and 3W.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 3X and 3W.
•  Is the voltage at body control module (BCM) terminals 3X and 3W the same?
Yes
Repair or replace the wiring harness between the connector C-39 and body control module (BCM) because the wiring harness is shorted between circuits.
No
Go to the next step.
3
INSPECT CAN LINE BETWEEN EPS CONTROL MODULE AND CONNECTOR C-39 FOR SHORT BETWEEN CIRCUITS
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Inspect for continuity between EPS control module terminals 2C and 2A.
•  Is there continuity?
Yes
Go to the next step.
No
Go to Step 5.
4
INSPECT EPS CONTROL MODULE FOR SHORT BETWEEN CIRCUITS
•  Disconnect the EPS control module connector.
•  Inspect for continuity between EPS control module terminals 2C and 2A(wiring harness side).
•  Is there continuity?
Yes
Repair or replace the wiring harness between the EPS control module and connector C-39 because the wiring harness is shorted between circuits.
No
Replace the EPS control module because there is a short between circuits in the EPS control module.
5
INSPECT CAN LINE BETWEEN SELECTOR LEVER AND CONNECTOR C-39 FOR SHORT BETWEEN CIRCUITS
•  Inspect for continuity between selector lever terminals D and B.
•  Is there continuity?
Yes
Go to the next step.
No
Go to Step 7.
6
INSPECT SELECTOR LEVER FOR SHORT BETWEEN CIRCUITS
•  Disconnect the selector lever connector.
•  Inspect for continuity between selector lever terminals D and B (wiring harness side).
•  Is there continuity?
Yes
Repair or replace the wiring harness between the selector lever and connector C-39 because the wiring harness is shorted between circuits.
No
Replace the selector lever because there is a short between circuits in the selector lever.
7
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.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 3X and 3W.
•  Is the voltage at body control module (BCM) terminals 3X and 3W the same?
Yes
Repair or replace the wiring harness between the connector C-38 and connector C-39 because the wiring harness is shorted between circuits.
No
Go to the next step.
8
INSPECT CAN LINE BETWEEN AUTO LEVELING CONTROL MODULE / ADAPTIVE LED HEADLIGHTS CONTROL MODULE AND CONNECTOR C-38 FOR SHORT BETWEEN CIRCUITS
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Inspect for continuity between auto leveling control module / adaptive LED headlights control module terminals E and H.
•  Is there continuity?
Yes
Go to the next step.
No
Go to Step 10.
9
INSPECT AUTO LEVELING CONTROL MODULE / ADAPTIVE LED HEADLIGHTS CONTROL MODULE FOR SHORT BETWEEN CIRCUITS
•  Disconnect the auto leveling control module / adaptive LED headlights control module connector.
•  Inspect for continuity between auto leveling control module / adaptive LED headlights control module terminals E and H (wiring harness side).
•  Is there continuity?
Yes
Repair or replace the wiring harness between the auto leveling control module / adaptive LED headlights control module and connector C-38 because the wiring harness is shorted between circuits.
No
Replace the auto leveling control module / adaptive LED headlights control module because there is a short between circuits in the auto leveling control module / adaptive LED headlights control module.
10
INSPECT CAN LINE BETWEEN CONNECTOR C-13 AND CONNECTOR C-38 FOR SHORT BETWEEN CIRCUITS
•  Disconnect the connector C-13.
•  Connect the connector C-38.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 3X and 3W.
•  Is the voltage at body control module (BCM) terminals 3X and 3W the same?
Yes
Repair or replace the wiring harness between the connector C-38 and connector C-13 because the wiring harness is shorted between circuits.
No
Go to the next step.
11
INSPECT CAN LINE BETWEEN CONNECTOR C-21 AND CONNECTOR C-13 FOR SHORT BETWEEN CIRCUITS
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-21.
•  Connect the connector C-13.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 3X and 3W.
•  Is the voltage at body control module (BCM) terminals 3X and 3W the same?
Yes
Repair or replace the wiring harness between connector C-21 and connector C-13 because the wiring harness is shorted between circuits.
No
Go to the next step.
12
INSPECT CAN LINE BETWEEN CONNECTOR C-21 AND PCM FOR SHORT BETWEEN CIRCUITS
•  Measure the voltage at PCM terminals AK and AL.
•  Is the voltage at PCM terminals AK and AL the same?
Yes
Go to Step 16.
No
Go to the next step.
13
INSPECT CAN LINE BETWEEN CONNECTOR C-21 AND CONNECTORS C-71, C-72 FOR SHORT BETWEEN CIRCUITS
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connectors C-71, C-72.
•  Connect the connector C-21.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 3X and 3W.
•  Is the voltage at body control module (BCM) terminals 3X and 3W the same?
Yes
Repair or replace the wiring harness between connector C-21 and connectors C-71, C-72 because the wiring harness is shorted between circuits.
No
Go to the next step.
14
INSPECT CAN LINE BETWEEN SAS CONTROL MODULE AND CONNECTORS C-71, C-72 FOR SHORT BETWEEN CIRCUITS
•  Measure the voltage at PCM terminals AK and AL.
•  Is the voltage at PCM terminals AK and AL the same?
Yes
Repair or replace the wiring harness between the connectors C-71, C-72 and connector C-21 because the wiring harness is shorted between circuits.
No
Go to the next step.
15
INSPECT SAS CONTROL MODULE FOR SHORT BETWEEN CIRCUITS
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the SAS control module connector.
•  Inspect for continuity between SAS control module terminals 3A and 3D (wiring harness side).
•  Is there continuity?
Yes
Repair or replace the wiring harness between the SAS control module and connectors C-71, C-72 because the wiring harness is shorted between circuits.
No
Replace the SAS control module because there is a short between circuits in the SAS control module.
16
INSPECT CAN LINE BETWEEN CONNECTOR C-07 AND CONNECTOR C-21 FOR SHORT BETWEEN CIRCUITS
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-07.
•  Connect the connector C-21.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 3X and 3W.
•  Is the voltage at body control module (BCM) terminals 3X and 3W the same?
Yes
Repair or replace the wiring harness between connector C-07 and connector C-21 because the wiring harness is shorted between circuits.
No
Go to the next step.
17
INSPECT CAN LINE BETWEEN ELECTRONICALLY CONTROLLED BRAKE UNIT AND CONNECTOR C-07, CONNECTOR C-34 FOR SHORT BETWEEN CIRCUITS
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Inspect for continuity between electronically controlled brake unit terminals 1AM and 1AO.
•  Is there continuity?
Yes
Go to the next step.
No
Go to Step 19.
18
INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR SHORT BETWEEN CIRCUITS
•  Disconnect the electronically controlled brake unit connector.
•  Inspect for continuity between electronically controlled brake unit terminals 1AM and 1AO (wiring harness side).
•  Is there continuity?
Yes
Repair or replace the wiring harness between the electronically controlled brake unit and connector C-07, connector C-34 because the wiring harness is shorted between circuits.
No
Replace the electronically controlled brake unit because there is a short between circuits in the electronically controlled brake unit.
19
INSPECT CAN LINE BETWEEN CONNECTOR C-34 AND CONNECTOR C-09 FOR SHORT BETWEEN CIRCUITS
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-09.
•  Connect the connector C-34.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 3X and 3W.
•  Is the voltage at body control module (BCM) terminals 3X and 3W the same?
Yes
Go to Step 22.
No
Go to the next step.
20
INSPECT CAN LINE BETWEEN CONNECTOR C-34 AND CONNECTOR C-02 AND CONNECTOR C-09 FOR SHORT BETWEEN CIRCUITS
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-02.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 3X and 3W.
•  Is the voltage at body control module (BCM) terminals 3X and 3W the same?
Yes
Repair or replace the wiring harness between the connector C-34 and connector C-02 and connector C-09 because the wiring harness is shorted between circuits.
No
Go to the next step.
21
INSPECT PARKING LOCK ACTUATOR FOR SHORT BETWEEN CIRCUITS
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the parking lock actuator connector.
•  Inspect for continuity between parking lock actuator terminals E and F (wiring harness side).
•  Is there continuity?
Yes
Repair or replace the wiring harness between the parking lock actuator and connector C-02 because the wiring harness is shorted between circuits.
No
Replace the parking lock actuator because there is a short between circuits in the parking lock actuator.
22
INSPECT PCM FOR SHORT BETWEEN CIRCUITS
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the PCM connector.
•  Inspect for continuity between PCM terminals AK and AL (wiring harness side).
•  Is there continuity?
Yes
Repair or replace the wiring harness between the PCM and connector C-09 because the wiring harness is shorted between circuits.
No
Replace the PCM because there is a short between circuits in the PCM.