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DETERMINING SHORT TO POWER SUPPLY LOCATION (MS-CAN)

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2016 – MX-5 – 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. (See 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-40 AND INSTRUMENT CLUSTER Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the connector C-40. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) 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.
		No	Go to the next step.
2	INSPECT INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the instrument cluster connector. Connect the connector C-40. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) 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.)
		No	Repair or replace the wiring harness between the instrument cluster and connector C-40 because the wiring harness is shorted to the power supply.
3	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTORS C-40 AND DLC-2 Measure the voltage at DLC-2 terminals L and K. Is the voltage 0 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between DLC-2 and connector C-40 because the wiring harness is shorted to the power supply.
4	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTOR C-40 AND CONNECTOR C-14 Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the connector C-14. Connect the connector C-40. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) 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.
		No	Repair or replace the wiring harness between connector C-40 and connector C-14 because the wiring harness is shorted to the power supply.
5	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTOR C-14 AND CLIMATE CONTROL UNIT Measure the voltage at climate control unit terminals D and B. Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Go to Step 8.
6	INSPECT FOR SHORT TO POWER SUPPLY BETWEEN BLIND SPOT MONITORING (BSM) CONTROL MODULE (LH) AND CONNECTOR C-26 Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the connector C-26. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Switch the ignition ON (engine off). Measure the voltage at blind spot monitoring (BSM) control module (LH) terminals D and E. Is the voltage between 1.5—3.5 V?	Yes	Repair or replace the wiring harness between the connector C-14 and connector C-26 because the wiring harness is shorted to the power supply.
		No	Go to the next step.
7	INSPECT BLIND SPOT MONITORING (BSM) CONTROL MODULE (LH) FOR SHORT TO POWER SUPPLY Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the blind spot monitoring (BSM) control module (LH) connector. Connect the connector C-26. Connect the connector C-14. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) 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 blind spot monitoring (BSM) control module (LH) because there is a short to power supply in the blind spot monitoring (BSM) control module (LH). (See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the blind spot monitoring (BSM) control module (LH) and connector C-26 because the wiring harness is shorted to the power supply.
8	INSPECT CLIMATE CONTROL UNIT FOR SHORT TO POWER SUPPLY Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the climate control unit connector. Connect the connector C-14. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) 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 [FULL-AUTO AIR CONDITIONER].) (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
		No	Repair or replace the wiring harness between the climate control unit and connector C-14 because the wiring harness is shorted to the power supply.

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