DETERMINING SHORT TO GROUND LOCATION (MS-CAN) [MZR 1.6 (R.H.D.)]

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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 [MZR 1.6 (R.H.D.)].)

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 CONNECTOR C-34 AND REAR BODY CONTROL MODULE (RBCM) •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) •  Disconnect 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	Go to Step 5.
		No	Go to the next step.
2	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-34 AND PARKING ASSIST UNIT •  Inspect for continuity at the following terminals: ―  Between parking assist unit terminal AA and body ground ―  Between parking assist unit terminal AB and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 4.
3	INSPECT CAN LINE IN PARKING ASSIST UNIT FOR SHORT TO GROUND •  Disconnect the parking assist unit connector. •  Inspect for continuity at the following terminals: ―  Between parking assist unit terminal AA (wiring harness side) and body ground ―  Between parking assist unit terminal AB (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between parking assist unit and connector C-34 because the wiring harness is shorted to ground.
		No	Replace the parking assist unit because there is a short to ground inside the parking assist unit. (See PARKING ASSIST UNIT REMOVAL/INSTALLATION.)
4	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-34 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.)
5	INSPECT CAN LINE IN JB No.2 FOR SHORT TO GROUND •  Connect connector C-34. •  Disconnect connector C-33. •  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	Replace the JB No.2 because there is a short to ground in the JB No.2.
		No	Go to the next step.
6	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-33 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-33 and DLC-2 because the wiring harness is shorted to ground.
		No	Go to the next step.
7	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-33 AND CLIMATE CONTROL UNIT •  Inspect for continuity at the following terminals: ―  Between climate control unit terminal 1S and body ground (with full-auto air conditioner (dual type)) ―  Between climate control unit terminal 1U and body ground (with full-auto air conditioner (dual type)) ―  Between climate control unit terminal D and body ground (with full-auto air conditioner (single type)) ―  Between climate control unit terminal B and body ground (with full-auto air conditioner (single type)) •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 9.
8	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 1S (wiring harness side) and body ground (with full-auto air conditioner (dual type)) ―  Between climate control unit terminal 1U (wiring harness side) and body ground (with full-auto air conditioner (dual type)) ―  Between climate control unit terminal D (wiring harness side) and body ground (with full-auto air conditioner (single type)) ―  Between climate control unit terminal B (wiring harness side) and body ground (with full-auto air conditioner (single type)) •  Is there continuity?	Yes	Repair or replace the wiring harness between the climate control unit and connector C-33 because the wiring harness is shorted to ground.
		No	Replace the climate control unit because there is a short to ground inside the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
9	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-59 AND CONNECTOR C-33 •  Disconnect connector C-59. •  Connect connector C-33. •  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-59 and connector C-33 because the wiring harness is shorted to ground.
		No	Go to the next step.
10	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-59 AND REAR BODY CONTROL MODULE (RBCM) •  Disconnect the rear body control module (RBCM) connector. •  Connect connector C-59. •  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-59 and rear body control module (RBCM) because the wiring harness is shorted to ground.
		No	Go to the next step.
11	INSPECT FOR SHORT TO GROUND BETWEEN BLIND SPOT MONITORING (BSM) CONTROL MODULE (LH) AND REAR BODY CONTROL MODULE (RBCM) •  Inspect for continuity at the following terminals: ―  Between rear body control module (RBCM) terminal 4G (wiring harness side) and body ground ―  Between rear body control module (RBCM) terminal 4J (wiring harness side) and body ground •  Is there continuity?	Yes	Go to the next step.
		No	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.)
12	INSPECT FOR SHORT TO GROUND BETWEEN BLIND SPOT MONITORING (BSM) CONTROL MODULE (LH) AND CONNECTOR C-19 •  Disconnect connector C-19. •  Inspect for continuity at the following terminals: ―  Between blind spot monitoring (BSM) control module (LH) terminal D and body ground ―  Between blind spot monitoring (BSM) control module (LH) terminal E and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the rear body control module (RBCM) and connector C-19 because the wiring harness is shorted to ground.
13	INSPECT CAN LINE IN BLIND SPOT MONITORING (BSM) CONTROL MODULE (LH) FOR SHORT TO GROUND •  Disconnect the blind spot monitoring (BSM) control module (LH) connector. •  Inspect for continuity at the following terminals: ―  Between blind spot monitoring (BSM) control module (LH) terminal D (wiring harness side) and body ground ―  Between blind spot monitoring (BSM) control module (LH) terminal E (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the blind spot monitoring (BSM) control module (LH) and connector C-19 because the wiring harness is shorted to ground.
		No	Replace the blind spot monitoring (BSM) control module (LH) because there is a short to ground in the blind spot monitoring (BSM) control module (LH). (See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION [Except Australian specs.].)