DTC U0142:68 [BCM]

id0902f5070900

Description

Communication error with electrical supply unit (ESU)

Detection condition

•  BCM could not receive the signals from the electrical supply unit (ESU) for 5 s or more with the ignition switched ON (engine off or on).

Fail-safe

Exterior lighting system

•  Turn the TNS and headlights LO on, and turn off other exterior light controls.

Possible cause

•  Electrical supply unit (ESU) connector or terminal malfunction

•  BCM connector or terminal malfunction

•  Short to ground in wiring harness between electrical supply unit (ESU) terminal 2I and BCM terminal 2Y

•  Short to power supply in wiring harness between electrical supply unit (ESU) terminal 2I and BCM terminal 2Y

•  Open circuit in wiring harness between electrical supply unit (ESU) terminal 2I and BCM terminal 2Y

•  Electrical supply unit (ESU) malfunction

•  BCM malfunction

Description	Communication error with electrical supply unit (ESU)
Detection condition	• BCM could not receive the signals from the electrical supply unit (ESU) for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe	Exterior lighting system • Turn the TNS and headlights LO on, and turn off other exterior light controls.
Possible cause	• Electrical supply unit (ESU) connector or terminal malfunction • BCM connector or terminal malfunction • Short to ground in wiring harness between electrical supply unit (ESU) terminal 2I and BCM terminal 2Y • Short to power supply in wiring harness between electrical supply unit (ESU) terminal 2I and BCM terminal 2Y • Open circuit in wiring harness between electrical supply unit (ESU) terminal 2I and BCM terminal 2Y • Electrical supply unit (ESU) malfunction • BCM malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY BCM DTCs AGAIN • Clear the DTC for the BCM using the M-MDS. (See CLEARING DTC [BCM].) • Switch the ignition ON (engine off or on) and wait for 5 s or more. • Retrieve the BCM DTCs using the M-MDS. (See DTC INSPECTION [BCM].) • Is the same DTC displayed?	Yes	Go to the next step.
1		No	Go to Step 9.
2	INSPECT ELECTRICAL SUPPLY UNIT (ESU) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Disconnect the electrical supply unit (ESU) connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 8.
3	INSPECT BCM CONNECTOR CONDITION • Disconnect the BCM connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
3		No	Repair or replace the connector, then go to Step 8.
4	INSPECT ELECTRICAL SUPPLY UNIT (ESU) CIRCUIT FOR SHORT TO GROUND • Verify that the electrical supply unit (ESU) and BCM connectors are disconnected. • Inspect for continuity between BCM terminal 2Y (wiring harness-side) and body ground. • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between electrical supply unit (ESU) terminal 2I and BCM terminal 2Y. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 8.
4		No	Go to the next step.
5	INSPECT ELECTRICAL SUPPLY UNIT (ESU) CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the electrical supply unit (ESU) and BCM connectors are disconnected. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Switch the ignition ON (engine off or on). • Measure the voltage at the BCM terminal 2Y (wiring harness-side). • Is the voltage 0 V?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between electrical supply unit (ESU) terminal 2I and BCM terminal 2Y. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to Step 8.
6	INSPECT ELECTRICAL SUPPLY UNIT (ESU) CIRCUIT FOR OPEN CIRCUIT • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Verify that the electrical supply unit (ESU) and BCM connectors are disconnected. • Inspect the wiring harness for continuity between electrical supply unit (ESU) terminal 2I (wiring harness-side) and BCM terminal 2Y (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between electrical supply unit (ESU) terminal 2I and BCM terminal 2Y. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 8.
7	VERIFY IF MALFUNCTIONING LOCATION IS ELECTRICAL SUPPLY UNIT (ESU) DEPENDING ON REPEATABILITY • Always reconnect all disconnected connectors. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Clear the DTC for the BCM using the M-MDS. (See CLEARING DTC [BCM].) • Switch the ignition ON (engine off or on) and wait for 5 s or more. • Retrieve the BCM DTCs using the M-MDS. (See DTC INSPECTION [BCM].) • Is the same DTC displayed?	Yes	Replace the electrical supply unit (ESU), then go to the next step. (See ELECTRICAL SUPPLY UNIT (ESU) REMOVAL/INSTALLATION.)
7		No	Go to Step 9.
8	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Clear the DTC for the BCM using the M-MDS. (See CLEARING DTC [BCM].) • Switch the ignition ON (engine off or on) and wait for 5 s or more. • Retrieve the BCM DTCs using the M-MDS. (See DTC INSPECTION [BCM].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.) Go to the next step.
8		No	Go to the next step.
9	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [BCM].)
9		No	DTC troubleshooting completed.