DETERMINING SHORT TO GROUND LOCATION (MS-CAN)

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2014 - Mazda6 - Multiplex Communication System

DETERMINING SHORT TO GROUND LOCATION (MS-CAN)

CAUTION:

Perform the following malfunction diagnosis only when it is diagnosed with a short to ground by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.

System wiring diagram

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 DLC-2, touch it with a paper clip or similar thin pin without directly inserting a tester into the terminals.


Step	Inspection		Action
1	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-35 AND INSTRUMENT CLUSTER Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect the connector C-35. Inspect for continuity at the following terminals: Between instrument cluster terminal C and body ground Between instrument cluster terminal E and body ground Is there continuity?	Yes	Go to the next step.
1		No	Go to Step 3.
2	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 C (wiring harness side) and body ground Between instrument cluster terminal E (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the instrument cluster and connector C-35 because the wiring harness is shorted to ground.
2		No	Replace the instrument cluster because there is a short to ground in the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
3	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-35 AND AUDIO UNIT Inspect for continuity at the following terminals: Between audio unit terminal 1O and body ground Between audio unit terminal 1Q and body ground Is there continuity?	Yes	Go to the next step.
3		No	Go to Step 5.
4	INSPECT CAN LINE IN AUDIO UNIT FOR SHORT TO GROUND Disconnect the audio unit connector. Inspect for continuity at the following terminals: Between audio unit terminal 1O (wiring harness side) and body ground Between audio unit terminal 1Q (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the audio unit and connector C-35 because the wiring harness is shorted to ground.
4		No	Replace the audio unit because there is a short to ground inside the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.)
5	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-35 AND SIRIUS SATELLITE RADIO UNIT Inspect for continuity at the following terminals: Between SIRIUS satellite radio unit terminal L and body ground Between SIRIUS satellite radio unit terminal K and body ground Is there continuity?	Yes	Go to the next step.
5		No	Go to Step 7.
6	INSPECT CAN LINE IN SIRIUS SATELLITE RADIO UNIT FOR SHORT TO GROUND Disconnect the SIRIUS satellite radio unit connector. Inspect for continuity at the following terminals: Between SIRIUS satellite radio unit terminal L (wiring harness side) and body ground Between SIRIUS satellite radio unit terminal K (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the SIRIUS satellite radio unit and connector C-35 because the wiring harness is shorted to ground.
6		No	Replace the SIRIUS satellite radio unit because there is a short to ground in the SIRIUS satellite radio unit. (See SIRIUS SATELLITE RADIO UNIT REMOVAL/INSTALLATION.)
7	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-35 AND CLIMATE CONTROL UNIT OR CLOCK Inspect for continuity at the following terminals: Between climate control unit terminal 1S and body ground (with full-auto air conditioner) Between climate control unit terminal 1U and body ground (with full-auto air conditioner) Between clock terminal E and body ground (with manual air conditioner) Between clock terminal G and body ground (with manual air conditioner) Is there continuity?	Yes	Go to the next step.
7		No	Go to Step 9.
8	INSPECT CAN LINE IN CLIMATE CONTROL UNIT OR CLOCK FOR SHORT TO GROUND Disconnect the climate control unit connector or clock connector. Inspect for continuity at the following terminals: Between climate control unit terminal 1S (wiring harness side) and body ground (with full-auto air conditioner) Between climate control unit terminal 1U (wiring harness side) and body ground (with full-auto air conditioner) Between clock terminal E (wiring harness side) and body ground (with manual air conditioner) Between clock terminal G (wiring harness side) and body ground (with manual air conditioner) Is there continuity?	Yes	Repair or replace the wiring harness between the climate control unit or clock and connector C-35 because the wiring harness is shorted to ground.
8		No	Replace the climate control unit or clock because there is a short to ground inside the climate control unit or clock. (See CLOCK REMOVAL/INSTALLATION.) (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
9	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-34 AND REAR BODY CONTROL MODULE (RBCM) Disconnect connector C-34. Inspect for continuity at the following terminals: Between rear body control module (RBCM) terminal 3E and body ground Between rear body control module (RBCM) terminal 3G and body ground Is there continuity?	Yes	Go to Step 13.
9		No	Go to the next step.
10	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-34 AND DLC-2 Inspect for continuity at the following terminals: Between DLC-2 terminal L and body ground Between DLC-2 terminal K and body ground Is there continuity?	Yes	Repair or replace the wiring harness between connector C-34 and DLC-2 because the wiring harness is shorted to ground.
10		No	Go to the next step.
11	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-34 AND CLIMATE CONTROL UNIT Inspect for continuity at the following terminals: Between climate control unit terminal U and body ground (with manual air conditioner) Between climate control unit terminal W and body ground (with manual air conditioner) Is there continuity?	Yes	Go to the next step.
11		No	Repair or replace the wiring harness between connector C-35 and connector C-34 because the wiring harness is shorted to ground.
12	INSPECT CAN LINE IN CLIMATE CONTROL UNIT FOR SHORT TO GROUND Disconnect the climate control unit connector. Inspect for continuity at the following terminals: Between climate control unit terminal U (wiring harness side) and body ground (with manual air conditioner) Between climate control unit terminal W (wiring harness side) and body ground (with manual air conditioner) Is there continuity?	Yes	Repair or replace the wiring harness between the climate control unit and connector C-34 because the wiring harness is shorted to ground.
12		No	Replace the climate control unit because there is a short to ground inside the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
13	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-08 AND C-34 Disconnect connector C-08. Connect connector C-34. Inspect for continuity at the following terminals: Between DLC-2 terminal L and body ground Between DLC-2 terminal K and body ground Is there continuity?	Yes	Repair or replace the wiring harness between connector C-08 and connector C-34 because the wiring harness is shorted to ground.
13		No	Go to the next step.
14	INSPECT FOR SHORT TO GROUND BETWEEN GROUND BETWEEN BSM CONTROL MODULE (LH) AND REAR BODY CONTROL MODULE (RBCM) Disconnect the rear body control module (RBCM) connector. Inspect for continuity at the following terminals: Between rear body control module (RBCM) terminal 4I (wiring harness side) and body ground Between rear body control module (RBCM) terminal 4L (wiring harness side) and body ground Is there continuity?	Yes	Go to the next step.
14		No	Go to Step 17.
15	INSPECT FOR SHORT TO GROUND BETWEEN BSM CONTROL MODULE (LH) AND CONNECTOR C-23 Disconnect connector C-23. Inspect for continuity at the following terminals: Between BSM control module (LH) terminal C and body ground Between BSM control module (LH) terminal D and body ground Is there continuity?	Yes	Go to the next step.
15		No	Repair or replace the wiring harness between the rear body control module (RBCM) and connector C-23 because the wiring harness is shorted to ground.
16	INSPECT CAN LINE IN BSM CONTROL MODULE (LH) FOR SHORT TO GROUND Disconnect the BSM control module (LH) connector. Inspect for continuity at the following terminals: Between BSM control module (LH) terminal C (wiring harness side) and body ground Between BSM control module (LH) terminal D (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the BSM control module (LH) and connector C-23 because the wiring harness is shorted to ground.
16		No	Replace the BSM control module (LH) because there is a short to ground in the BSM control module (LH). (See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION.)
17	INSPECT CAN LINE IN REAR BODY CONTROL MODULE (RBCM) FOR SHORT TO GROUND Inspect for continuity at the following terminals: Between rear body control module (RBCM) terminal 3E and body ground Between rear body control module (RBCM) terminal 3G and body ground Is there continuity?	Yes	Replace the rear body control module (RBCM) because there is a short to ground in the rear body control module (RBCM). (See REAR BODY CONTROL MODULE (RBCM) REMOVAL/INSTALLATION.)
17		No	Repair or replace the wiring harness between the rear body control module (RBCM) and connector C-08 because the wiring harness is shorted to ground.

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