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

id100232000600

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 (L.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 FRONT BODY CONTROL MODULE (FBCM) AND INSTRUMENT CLUSTER •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) •  Disconnect connector 2 which has front body control module (FBCM) terminals 2P and 2N. •  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 9.
		No	Go to the next step.
2	INSPECT CAN LINE IN FRONT BODY CONTROL MODULE (FBCM) FOR SHORT TO GROUND •  Inspect for continuity at the following terminals: ―  Between front body control module (FBCM) terminal 2P and body ground ―  Between front body control module (FBCM) terminal 2N and body ground •  Is there continuity?	Yes	Replace the front body control module (FBCM) because there is a short to ground in the front body control module (FBCM). (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)
		No	Go to the next step.
3	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-32 AND FRONT BODY CONTROL MODULE (FBCM) •  Disconnect connector C-32. •  Connect connector 2 which has front body control module (FBCM) terminals 2P and 2N. •  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-32 and front body control module (FBCM) because the wiring harness is shorted to ground.
		No	Go to the next step.
4	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-32 AND AFS CONTROL MODULE / AUTO LEVELING CONTROL MODULE OR ADAPTIVE LED HEADLIGHTS CONTROL MODULE •  Inspect for continuity at the following terminals: ―  Between AFS control module / auto leveling control module or adaptive LED headlights control module terminal A and body ground ―  Between AFS control module / auto leveling control module or adaptive LED headlights control module terminal B and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 6.
5	INSPECT CAN LINE IN AFS CONTROL MODULE / AUTO LEVELING CONTROL MODULE OR ADAPTIVE LED HEADLIGHTS CONTROL MODULE FOR SHORT TO GROUND •  Disconnect the AFS control module / auto leveling control module or adaptive LED headlights control module connector. •  Inspect for continuity at the following terminals: ―  Between AFS control module / auto leveling control module or adaptive LED headlights control module terminal A (wiring harness side) and body ground ―  Between AFS control module / auto leveling control module or adaptive LED headlights control module terminal B (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the AFS control module / auto leveling control module or adaptive LED headlights control module and connector C-32 because the wiring harness is shorted to ground.
		No	Replace the AFS control module / auto leveling control module or adaptive LED headlights control module because there is a short to ground in the AFS control module / auto leveling control module or adaptive LED headlights control module. (See ADAPTIVE LED HEADLIGHTS CONTROL MODULE REMOVAL/INSTALLATION.) (See ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE REMOVAL/INSTALLATION.) (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)
6	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-60 AND CONNECTOR C-32 •  Disconnect connector C-60. •  Connect connector C-32. •  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-32 and connector C-60 because the wiring harness is shorted to ground.
		No	Go to the next step.
7	INSPECT FOR SHORT TO GROUND BETWEEN DSC HU/CM OR ABS HU/CM AND CONNECTOR C-60 •  Inspect for continuity at the following terminals: ―  Between DSC HU/CM terminal AF and body ground (with DSC) ―  Between DSC HU/CM terminal AC and body ground (with DSC) ―  Between ABS HU/CM terminal H and body ground (without DSC) ―  Between ABS HU/CM terminal L and body ground (without DSC) •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 31.
8	INSPECT CAN LINE IN DSC HU/CM OR ABS HU/CM FOR SHORT TO GROUND •  Disconnect the DSC HU/CM or ABS HU/CM connector. •  Inspect for continuity at the following terminals: ―  Between DSC HU/CM terminal AF (wiring harness side) and body ground (with DSC) ―  Between DSC HU/CM terminal AC (wiring harness side) and body ground (with DSC) ―  Between ABS HU/CM terminal H (wiring harness side) and body ground (without DSC) ―  Between ABS HU/CM terminal L (wiring harness side) and body ground (without DSC) •  Is there continuity?	Yes	Repair or replace the wiring harness between the DSC HU/CM or ABS HU/CM and connector C-60 because the wiring harness is shorted to ground.
		No	Replace the DSC HU/CM or ABS HU/CM because there is a short to ground in the DSC HU/CM or ABS HU/CM. (See DSC HU/CM REMOVAL/INSTALLATION.) (See ABS HU/CM REMOVAL/INSTALLATION.)
9	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-03 AND INSTRUMENT CLUSTER •  Disconnect connector C-03. •  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	Repair or replace the wiring harness between connector C-03 and front body control module (FBCM) because the wiring harness is shorted to ground.
10	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-12 AND INSTRUMENT CLUSTER •  Disconnect connector C-12. •  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	Repair or replace the wiring harness between connector C-03 and connector C-12 because the wiring harness is shorted to ground.
11	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-12 AND CONNECTOR C-33 •  Disconnect connector C-33. •  Connect connector C-12. •  Connect connector C-03. •  Connect connector 2 which has front body control module (FBCM) terminals 2P and 2N. •  Inspect for continuity at the following terminals: ―  Between front body control module (FBCM) terminal 2P and body ground ―  Between front body control module (FBCM) terminal 2N and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connector C-12 and connector C-33 because the wiring harness is shorted to ground.
12	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-33 AND DLC-2 •  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 DLC-2 and connector C-33 because the wiring harness is shorted to ground.
		No	Go to the next step.
13	INSPECT FOR SHORT TO GROUND BETWEEN EPS CONTROL MODULE AND CONNECTOR C-33 •  Inspect for continuity at the following terminals: ―  Between EPS control module terminal 2B and body ground ―  Between EPS control module terminal 2D and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 15.
14	INSPECT CAN LINE IN EPS CONTROL MODULE FOR SHORT TO GROUND •  Disconnect the EPS control module connector. •  Inspect for continuity at the following terminals: ―  Between EPS control module terminal 2B (wiring harness side) and body ground ―  Between EPS control module terminal 2D (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the EPS control module and connector C-33 because the wiring harness is shorted to ground.
		No	Replace the EPS control module because there is a short to ground in the EPS control module. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
15	INSPECT FOR SHORT TO GROUND BETWEEN START STOP UNIT AND CONNECTOR C-33 •  Inspect for continuity at the following terminals: ―  Between start stop unit terminal 2M and body ground ―  Between start stop unit terminal 2O and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 17.
16	INSPECT CAN LINE IN START STOP UNIT FOR SHORT TO GROUND •  Disconnect the start stop unit connector. •  Inspect for continuity at the following terminals: ―  Between start stop unit terminal 2M (wiring harness side) and body ground ―  Between start stop unit terminal 2O (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the start stop unit and connector C-33 because the wiring harness is shorted to ground.
		No	Replace the start stop unit because there is a short to ground in the start stop unit. (See START STOP UNIT REMOVAL/INSTALLATION.)
17	INSPECT CAN LINE IN JB No.2 FOR SHORT TO GROUND •  Disconnect connector C-34. •  Connect connector C-33. •  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	Replace the JB No.2 because there is a short to ground in the JB No.2.
		No	Go to the next step.
18	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND CONNECTOR C-34 •  Inspect for continuity at the following terminals: ―  Between connectivity master unit (CMU) terminal 2E and body ground ―  Between connectivity master unit (CMU) terminal 2F and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 20.
19	INSPECT CAN LINE IN CONNECTIVITY MASTER UNIT (CMU) FOR SHORT TO GROUND •  Disconnect the connectivity master unit (CMU) connector. •  Inspect for continuity at the following terminals: ―  Between connectivity master unit (CMU) terminal 2E (wiring harness side) and body ground ―  Between connectivity master unit (CMU) terminal 2F (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the connectivity master unit (CMU) and connector C-34 because the wiring harness is shorted to ground.
		No	Replace the connectivity master unit (CMU) because there is a short to ground in the connectivity master unit (CMU). (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION.)
20	INSPECT FOR SHORT TO GROUND BETWEEN MAZDA ERA-GLONASS CONTROL MODULE AND CONNECTOR C-34 •  Inspect for continuity at the following terminals: ―  Between MAZDA ERA-GLONASS control module terminal 1Q and body ground. ―  Between MAZDA ERA-GLONASS control module terminal 1S and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 23.
21	INSPECT FOR SHORT TO GROUND BETWEEN MAZDA ERA-GLONASS CONTROL MODULE AND CONNECTOR C-62 •  Disconnect connector C-62. •  Inspect for continuity at the following terminals: ―  Between MAZDA ERA-GLONASS control module terminal 1Q and body ground. ―  Between MAZDA ERA-GLONASS control module terminal 1S and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connector C-62 and connector C-34 because the wiring harness is shorted to ground.
22	INSPECT CAN LINE IN MAZDA ERA-GLONASS CONTROL MODULE FOR SHORT TO GROUND •  Disconnect the MAZDA ERA-GLONASS control module connector. •  Inspect for continuity at the following terminals: ―  Between MAZDA ERA-GLONASS control module terminal 1Q (wiring harness side) and body ground. ―  Between MAZDA ERA-GLONASS control module terminal 1S (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the MAZDA ERA-GLONASS control module and connector C-62 because the wiring harness is shorted to ground.
		No	Replace the MAZDA ERA-GLONASS control module because there is a short to ground in the MAZDA ERA-GLONASS control module. (See MAZDA ERA-GLONASS CONTROL MODULE REMOVAL/INSTALLATION.)
23	INSPECT FOR SHORT TO GROUND BETWEEN SAS CONTROL MODULE AND CONNECTOR C-34 •  Inspect for continuity at the following terminals: ―  Between SAS control module terminal 3B and body ground ―  Between SAS control module terminal 3C and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 25.
24	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 3B (wiring harness side) and body ground ―  Between SAS control module terminal 3C (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the SAS control module and connector C-34 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.)
25	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-09 AND CONNECTOR C-34 •  Disconnect connector C-09. •  Connect connector C-34. •  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-34 and connector C-09 because the wiring harness is shorted to ground.
		No	Go to the next step.
26	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-09 AND CONNECTOR C-40 •  Disconnect connector C-40. •  Connect connector C-09. •  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-09 and connector C-40 because the wiring harness is shorted to ground.
		No	Go to the next step.
27	INSPECT FOR SHORT TO GROUND BETWEEN AUDIO AMPLIFIER AND CONNECTOR C-40 •  Inspect for continuity at the following terminals: ―  Between audio amplifier terminal 2L and body ground ―  Between audio amplifier terminal 2N and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 29.
28	INSPECT CAN LINE IN AUDIO AMPLIFIER FOR SHORT TO GROUND •  Disconnect the audio amplifier connector. •  Inspect for continuity at the following terminals: ―  Between audio amplifier terminal 2L (wiring harness side) and body ground ―  Between audio amplifier terminal 2N (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the audio amplifier and connector C-40 because the wiring harness is shorted to ground.
		No	Replace the audio amplifier because there is a short to ground in the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION.)
29	INSPECT FOR SHORT TO GROUND BETWEEN INSTRUMENT CLUSTER AND CONNECTOR C-09 •  Disconnect connector C-09. •  Inspect for continuity at the following terminals: ―  Between instrument cluster terminal B and body ground ―  Between instrument cluster terminal D and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between connector C-40 and connector C-09 because the wiring harness is shorted to ground.
30	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 B (wiring harness side) and body ground ―  Between instrument cluster terminal D (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the instrument cluster and connector C-09 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.)
31	INSPECT CAN LINE IN PCM FOR SHORT TO GROUND •  Disconnect the PCM connector. •  Inspect for continuity at the following terminals: ―  Between PCM terminal 1BE (wiring harness side) and body ground ―  Between PCM terminal 1AZ (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the PCM and connector C-60 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 1.6].)