DETERMINING SHORT TO GROUND LOCATION (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (R.H.D. (MZR 1.5))]

id0902m9003700

Caution

•  Perform the following malfunction diagnosis only when it is diagnosed with a short to ground by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [MULTIPLEX COMMUNICATION SYSTEM (R.H.D. (MZR 1.5))].

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 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 BCM AND INSTRUMENT CLUSTER •  Disconnect the negative battery cable. •  Disconnect connector 1 which has the BCM 1A and 1B terminals. •  Inspect for continuity at the following terminals: ―  Between DLC-2 terminal F and body ground ―  Between DLC-2 terminal E and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 16.
2	INSPECT CAN LINE INSIDE BCM FOR SHORT TO GROUND •  Disconnect connector 2 which has the BCM 2A and 2B terminals. •  Inspect for continuity at the following terminals: ―  Between DLC-2 terminal F and body ground ―  Between DLC-2 terminal E and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Replace the BCM because there is a short to ground in the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [R.H.D.].)
3	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-17 AND INSTRUMENT CLUSTER •  Disconnect connector C-17. •  Inspect for continuity at the following terminals: ―  Between DLC-2 terminal F and body ground ―  Between DLC-2 terminal E and body ground •  Is there continuity?	Yes	Go to Step 7.
		No	Go to the next step.
4	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-17 AND REAR VEHICLE MONITORING CONTROL MODULE (RH) •  Inspect for continuity at the following terminals: ―  Between rear vehicle monitoring control module (RH) terminal L and body ground ―  Between rear vehicle monitoring control module (RH) terminal I and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the BCM and connector C-17 because the wiring harness is shorted to ground.
5	INSPECT FOR SHORT TO GROUND BETWEEN REAR VEHICLE MONITORING CONTROL MODULE (RH) AND CONNECTOR C-24 •  Disconnect connector C-24. •  Inspect for continuity at the following terminals: ―  Between rear vehicle monitoring control module (RH) terminal L and body ground ―  Between rear vehicle monitoring control module (RH) terminal I and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connector C-24 and connector C-17 because the wiring harness is shorted to ground.
6	INSPECT CAN LINE IN REAR VEHICLE MONITORING CONTROL MODULE (RH) FOR SHORT TO GROUND •  Disconnect the rear vehicle monitoring control module (RH) connector. •  Inspect for continuity at the following terminals: ―  Between rear vehicle monitoring control module (RH) terminal L (wiring harness side) and body ground ―  Between rear vehicle monitoring control module (RH) terminal I (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between rear vehicle monitoring control module (RH) and connector C-24 because the wiring harness is shorted to ground.
		No	Replace the rear vehicle monitoring control module (RH) because there is a short to ground in the rear vehicle monitoring control module (RH). (See REAR VEHICLE MONITORING CONTROL MODULE REMOVAL/INSTALLATION.)
7	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-43 AND INSTRUMENT CLUSTER •  Disconnect connector C-43. •  Inspect for continuity at the following terminals: ―  Between DLC-2 terminal F and body ground ―  Between DLC-2 terminal E and body ground •  Is there continuity?	Yes	Go to Step 11.
		No	Go to the next step.
8	INSPECT FOR SHORT TO GROUND BETWEEN AFS CONTROL MODULE AND CONNECTOR C-43 •  Inspect for continuity at the following terminals: ―  Between AFS control module terminal B and body ground ―  Between AFS control module terminal A and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 10.
9	INSPECT CAN LINE IN AFS CONTROL MODULE FOR SHORT TO GROUND •  Disconnect the AFS control module connector. •  Inspect for continuity at the following terminals: ―  Between AFS control module terminal B (wiring harness side) and body ground ―  Between AFS control module terminal A (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the AFS control module and connector C-43 because the wiring harness is shorted to ground.
		No	Replace the AFS control module because there is a short to ground in the AFS control module. (See AFS (ADAPTIVE FRONT LIGHTING SYSTEM) CONTROL MODULE REMOVAL/INSTALLATION.)
10	INSPECT CAN LINE IN SAS CONTROL MODULE FOR SHORT TO GROUND •  Disconnect the SAS control module connector. •  Inspect for continuity at the following terminals: ―  Between SAS control module terminal 3K (wiring harness side) and body ground ―  Between SAS control module terminal 3L (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the SAS control module and connector C-43/connector C-17 because the wiring harness is shorted to ground.
		No	Replace the SAS control module because there is a short to ground in the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
11	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-47 AND DLC-2 •  Disconnect connector C-47. •  Inspect for continuity at the following terminals: ―  Between DLC-2 terminal F and body ground ―  Between DLC-2 terminal E and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between connector C-47 and DLC-2 because the wiring harness is shorted to ground.
		No	Go to the next step.
12	INSPECT FOR SHORT TO GROUND BETWEEN KEYLESS CONTROL MODULE AND CONNECTOR C-47 •  Inspect for continuity at the following terminals: ―  Between keyless control module terminal 2K and body ground ―  Between keyless control module terminal 2L and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 14.
13	INSPECT CAN LINE IN KEYLESS CONTROL MODULE FOR SHORT TO GROUND •  Disconnect the keyless control module connector. •  Inspect for continuity at the following terminals: ―  Between keyless control module terminal 2K (wiring harness side) and body ground ―  Between keyless control module terminal 2L (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the keyless control module and connector C-47 because the wiring harness is shorted to ground.
		No	Replace the keyless control module because there is a short to ground in the keyless control module. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION.)
14	INSPECT FOR SHORT TO GROUND BETWEEN INSTRUMENT CLUSTER AND CONNECTOR C-47 •  Inspect for continuity at the following terminals: ―  Instrument cluster terminal 2B and body ground ―  Instrument cluster terminal 2D and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connector C-43 and connector C-47 because the wiring harness is shorted to ground.
15	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 2B (wiring harness side) and body ground ―  Between instrument cluster terminal 2D (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the instrument cluster and connector C-47 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.)
16	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-70 AND BCM •  Connect connector 1 which has BCM terminals 1A and 1B. •  Disconnect connector C-70. •  Inspect for continuity at the following terminals: ―  Between DLC-2 terminal F and body ground ―  Between DLC-2 terminal E and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness because the wiring harness is shorted to ground between connector C-70 and the BCM.
		No	Go to the next step.
17	INSPECT FOR SHORT TO GROUND BETWEEN TCM AND CONNECTOR C-70 •  Inspect for continuity at the following terminals: ―  Between TCM terminal A17 and body ground ―  Between TCM terminal A7 and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 19.
18	INSPECT CAN LINE IN TCM FOR SHORT TO GROUND •  Disconnect TCM connector. •  Inspect for continuity at the following terminals: ―  Between TCM terminal A17 (wiring harness side) and body ground ―  Between TCM terminal A7 (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between TCM and connector C-70 because there is a short to ground in the wiring harness.
		No	Replace the TCM because there is a short to ground in the TCM. (See TCM REMOVAL/INSTALLATION [DJVA-EL].)
19	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTORS C-41 AND C-70 •  Connect connector C-70. •  Disconnect connector C-41. •  Inspect for continuity at the following terminals: ―  Between DLC-2 terminal F and body ground ―  Between DLC-2 terminal E and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the connector C-41 and connector C-70 because there is short to ground in the wiring harness.
		No	Go to the next step.
20	INSPECT FOR SHORT TO GROUND BETWEEN ABS HU/CM AND CONNECTOR C-41 •  Inspect for continuity at the following terminals: ―  Between ABS HU/CM control module terminal H and body ground ―  Between ABS HU/CM control module terminal L and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 22.
21	INSPECT CAN LINE IN ABS HU/CM FOR SHORT TO GROUND •  Disconnect the ABS HU/CM connector. •  Inspect for continuity at the following terminals: ―  Between ABS HU/CM terminal H (wiring harness side) and body ground ―  Between ABS HU/CM terminal L (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the ABS HU/CM and connector C-41 because the wiring harness is shorted to ground.
		No	Replace the ABS HU/CM because there is a short to ground in the ABS HU/CM. (See ABS HU/CM REMOVAL/INSTALLATION.)
22	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-02 AND EHPAS CONTROL MODULE •  Connect connector C-41. •  Disconnect connector C-02. •  Inspect for continuity at the following terminals: ―  Between DLC-2 terminal F and body ground ―  Between DLC-2 terminal E and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 24.
23	INSPECT CAN LINE IN EHPAS CONTROL MODULE FOR SHORT TO GROUND •  Disconnect the EHPAS control module connector. •  Inspect for continuity at the following terminals: ―  Between EHPAS control module terminal 2D (wiring harness side) and body ground ―  Between EHPAS control module terminal 2B (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the EHPAS control module and connector C-02/connector C-41 because the wiring harness is shorted to ground.
		No	Replace the EHPAS control module because there is a short to ground in the EHPAS control module. (See ELECTRIC POWER STEERING OIL PUMP COMPONENT DISASSEMBLY/ASSEMBLY.)
24	INSPECT CAN LINE IN PCM FOR SHORT TO GROUND •  Disconnect the PCM connector. •  Inspect for continuity at the following terminals: ―  Between PCM terminal 1AE (wiring harness side) and body ground ―  Between PCM terminal 1AI (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the PCM and connector C-02 because the wiring harness is shorted to ground.
		No	Replace the PCM because there is a short to ground in the PCM. (See PCM REMOVAL/INSTALLATION [MZR 1.5, MZR 1.6].)