DETERMINING SHORT TO POWER SUPPLY LOCATION (MS-CAN)

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2014 - Mazda6 - Multiplex Communication System

DETERMINING SHORT TO POWER SUPPLY LOCATION (MS-CAN)

CAUTION:

Perform the following malfunction diagnosis only when it is diagnosed with a short to the power supply 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.

Disconnect the negative battery cable before performing any work that requires handling of connectors.


Step	Inspection		Action
1	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTOR C-35 AND INSTRUMENT CLUSTER Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect connector C-35. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at instrument cluster terminals C and E. Is the voltage between 1.5 - 3.5 V?	Yes	Go to Step 3.
1		No	Go to the next step.
2	INSPECT INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect the instrument cluster connector. Connect connector C-35. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals L and K. Is the voltage between 1.5 - 3.5 V?	Yes	Replace the instrument cluster because there is a short to the power supply in the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
2		No	Repair or replace the wiring harness between the instrument cluster and connector C-35 because the wiring harness is shorted to the power supply.
3	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTOR C-35 AND AUDIO UNIT Measure the voltage at audio unit terminals 1O and 1Q. Is the voltage between 1.5 - 3.5 V?	Yes	Go to Step 5.
3		No	Go to the next step.
4	INSPECT AUDIO UNIT FOR SHORT TO POWER SUPPLY Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect the audio unit connector. Connect connector C-35. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals L and K. Is the voltage between 1.5 - 3.5 V?	Yes	Replace the audio unit because there is a short to the power supply in the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.)
4		No	Repair or replace the wiring harness between the audio unit and connector C-35 because the wiring harness is shorted to the power supply.
5	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTOR C-35 AND SIRIUS SATELLIET RADIO UNIT Measure the voltage at SIRIUS satellite radio unit terminals L and K. Is the voltage between 1.5 - 3.5 V?	Yes	Go to Step 7.
5		No	Go to the next step.
6	INSPECT SIRIUS SATELLITE RADIO UNIT FOR SHORT TO POWER SUPPLY Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect the SIRIUS satellite radio unit connector. Connect connector C-35. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals L and K. Is the voltage between 1.5 - 3.5 V?	Yes	Replace the SIRIUS satellite radio unit because there is a short to power supply in the SIRIUS satellite radio unit. (See SIRIUS SATELLITE RADIO UNIT REMOVAL/INSTALLATION.)
6		No	Repair or replace the wiring harness between the SIRIUS satellite radio unit and connector C-35 because the wiring harness is shorted to the power supply.
7	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTOR C-35 AND CLIMATE CONTROL UNIT OR CLOCK Measure the voltage at climate control unit terminals 1S and 1U (with full-auto air conditioner). Measure the voltage at clock terminals E and G (with manual air conditioner). Is the voltage between 1.5 - 3.5 V?	Yes	Go to Step 9.
7		No	Go to the next step.
8	INSPECT CLIMATE CONTROL UNIT OR CLOCK FOR SHORT TO POWER SUPPLY Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect the climate control unit or clock connector. Connect connector C-35. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals L and K. Is the voltage between 1.5 - 3.5 V?	Yes	Replace the climate control unit or clock because there is a short to the power supply in the climate control unit or clock. (See CLOCK REMOVAL/INSTALLATION.) (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
8		No	Repair or replace the wiring harness between the climate control unit or clock and connector C-35 because the wiring harness is shorted to the power supply.
9	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTOR C-34 AND REAR BODY CONTROL MODULE (RBCM) Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect the connector C-34. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at rear body control module (RBCM) terminals 3E and 3G. Is the voltage between 1.5 - 3.5 V?	Yes	Go to the next step.
9		No	Go to Step 13.
10	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTOR C-34 AND DLC-2 Measure the voltage at DLC-2 terminals L and K. Is the voltage 0 V?	Yes	Go to the next step.
10		No	Repair or replace the wiring harness between DLC-2 and connector C-34 because the wiring harness is shorted to the power supply.
11	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTOR C-34 AND CLIMATE CONTROL UNIT Measure the voltage at climate control unit terminals U and W (with manual air conditioner). Is the voltage between 1.5 - 3.5 V?	Yes	Repair or replace the wiring harness between connector C-35 and connector C-34 because the wiring harness is shorted to the power supply.
11		No	Go to the next step.
12	INSPECT CLIMATE CONTROL UNIT FOR SHORT TO POWER SUPPLY Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect the climate control unit connector. Connect connector C-34. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals L and K. Is the voltage between 1.5 - 3.5 V?	Yes	Replace the climate control unit because there is a short to the power supply in the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
12		No	Repair or replace the wiring harness between the climate control unit and connector C-34 because the wiring harness is shorted to the power supply.
13	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTOR C-34 AND CONNECTOR C-08 Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect the connector C-08. Connect the connector C-34. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals L and K. Is the voltage between 1.5 - 3.5 V?	Yes	Go to the next step.
13		No	Repair or replace the wiring harness between connector C-34 and connector C-08 because the wiring harness is shorted to the power supply.
14	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN BSM CONTROL MODULE (LH) AND REAR BODY CONTROL MODULE (RBCM) Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect the rear body control module (RBCM) connector. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at BSM control modules (LH) terminals C and D. Is the voltage between 1.5 - 3.5 V?	Yes	Go to Step 17.
14		No	Go to the next step.
15	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN BSM CONTROL MODULE (LH) AND CONNECTOR C-23 Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect connector C-23. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at BSM control modules (LH) terminals C and D. Is the voltage between 1.5 - 3.5 V?	Yes	Repair or replace the wiring harness between the rear body control module (RBCM) and connector C-23 because the wiring harness is shorted to the power supply.
15		No	Go to the next step.
16	INSPECT BSM CONTROL MODULE (LH) FOR SHORT TO POWER SUPPLY Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect the BSM control modules (LH) connector. Connect connector C-23. Connect the rear body control module (RBCM) connector. Connect connector C-08. Connect connector C-34. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals L and K. Is the voltage between 1.5 - 3.5 V?	Yes	Replace the BSM control modules (LH) because there is a short to power supply in the BSM control modules (LH). (See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION.)
16		No	Repair or replace the wiring harness between the BSM control modules (LH) and connector C-23 because the wiring harness is shorted to the power supply.
17	INSPECT REAR BODY CONTROL MODULE (RBCM) FOR SHORT TO POWER SUPPLY Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Connect connector C-08. Connect connector C-34. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at DLC-2 terminals L and K. Is the voltage between 1.5 - 3.5 V?	Yes	Replace the rear body control module (RBCM) because there is a short to the power supply 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 the power supply.

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