DTC U0028:87 [REAR VEHICLE MONITORING SYSTEM]

id0902z2886700

Description

Rear vehicle monitoring control module (LH) and (RH) communication error

Detection condition

•  No communication between rear vehicle monitoring control modules (LH) and (RH) for 1 s or more.

Fail-safe function

•  Inhibits the rear vehicle monitoring system.

Possible cause

•  Rear vehicle monitoring control module (RH) connector or terminal malfunction

•  Rear vehicle monitoring control module (LH) connector or terminal malfunction

•  Short to ground in wiring harness between the following terminals:

―  Rear vehicle monitoring control module (LH) terminal H—Rear vehicle monitoring control module (RH) terminal A

―  Rear vehicle monitoring control module (LH) terminal J—Rear vehicle monitoring control module (RH) terminal D

•  Short to power supply in wiring harness between the following terminals:

―  Rear vehicle monitoring control module (LH) terminal H—Rear vehicle monitoring control module (RH) terminal A

―  Rear vehicle monitoring control module (LH) terminal J—Rear vehicle monitoring control module (RH) terminal D

•  Open circuit in wiring harness between the following terminals:

―  Rear vehicle monitoring control module (LH) terminal H—Rear vehicle monitoring control module (RH) terminal A

―  Rear vehicle monitoring control module (LH) terminal J—Rear vehicle monitoring control module (RH) terminal D

•  Rear vehicle monitoring control module (RH) malfunction

•  Rear vehicle monitoring control module (LH) malfunction

Description	Rear vehicle monitoring control module (LH) and (RH) communication error
Detection condition	• No communication between rear vehicle monitoring control modules (LH) and (RH) for 1 s or more.
Fail-safe function	• Inhibits the rear vehicle monitoring system.
Possible cause	• Rear vehicle monitoring control module (RH) connector or terminal malfunction • Rear vehicle monitoring control module (LH) connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ― Rear vehicle monitoring control module (LH) terminal H—Rear vehicle monitoring control module (RH) terminal A ― Rear vehicle monitoring control module (LH) terminal J—Rear vehicle monitoring control module (RH) terminal D • Short to power supply in wiring harness between the following terminals: ― Rear vehicle monitoring control module (LH) terminal H—Rear vehicle monitoring control module (RH) terminal A ― Rear vehicle monitoring control module (LH) terminal J—Rear vehicle monitoring control module (RH) terminal D • Open circuit in wiring harness between the following terminals: ― Rear vehicle monitoring control module (LH) terminal H—Rear vehicle monitoring control module (RH) terminal A ― Rear vehicle monitoring control module (LH) terminal J—Rear vehicle monitoring control module (RH) terminal D • Rear vehicle monitoring control module (RH) malfunction • Rear vehicle monitoring control module (LH) malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT REAR VEHICLE MONITORING CONTROL MODULE (RH) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Disconnect the rear vehicle monitoring control module (RH) 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.
1		No	Repair or replace the connector, then go to Step 6.
2	INSPECT REAR VEHICLE MONITORING CONTROL MODULE (LH) CONNECTOR CONDITION • Disconnect the rear vehicle monitoring control modules (LH) 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 6.
3	INSPECT FOR SHORT TO GROUND IN CAN COMMUNICATION CIRCUIT BETWEEN REAR VEHICLE MONITORING CONTROL MODULES (LH) AND (RH) • Verify that the rear vehicle monitoring control module (LH) and (RH) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Rear vehicle monitoring control module (RH) terminal A ― Rear vehicle monitoring control module (RH) terminal D • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Rear vehicle monitoring control module (LH) terminal H—Rear vehicle monitoring control module (RH) terminal A • Rear vehicle monitoring control module (LH) terminal J—Rear vehicle monitoring control module (RH) terminal D 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 6.
3		No	Go to the next step.
4	INSPECT FOR SHORT TO POWER SUPPLY IN CAN COMMUNICATION CIRCUIT BETWEEN REAR VEHICLE MONITORING CONTROL MODULES (LH) AND (RH) • Verify that the rear vehicle monitoring control module (LH) and (RH) connectors are disconnected. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Switch the ignition ON (engine off or on). • Measure the voltage at the following terminals (wiring harness-side): ― Rear vehicle monitoring control module (RH) terminal A ― Rear vehicle monitoring control module (RH) terminal D • Is the voltage 0 V?	Yes	Go to the next step.
4		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Rear vehicle monitoring control module (LH) terminal H—Rear vehicle monitoring control module (RH) terminal A • Rear vehicle monitoring control module (LH) terminal J—Rear vehicle monitoring control module (RH) terminal D 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 6.
5	INSPECT FOR OPEN CIRCUIT IN CAN COMMUNICATION CIRCUIT BETWEEN REAR VEHICLE MONITORING CONTROL MODULES (LH) AND (RH) • Verify that the rear vehicle monitoring control module (LH) and (RH) connectors are disconnected. • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Inspect for continuity between the following terminals (wiring harness-side): ― Rear vehicle monitoring control module (LH) terminal H—Rear vehicle monitoring control module (RH) terminal A ― Rear vehicle monitoring control module (LH) terminal J—Rear vehicle monitoring control module (RH) terminal D • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Rear vehicle monitoring control module (LH) terminal H—Rear vehicle monitoring control module (RH) terminal A • Rear vehicle monitoring control module (LH) terminal J—Rear vehicle monitoring control module (RH) terminal D 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 the next step.
6	PERFORM DTC INSPECTION AND VERIFY REAR VEHICLE MONITORING CONTROL MODULE (RH) MALFUNCTION • Always reconnect all disconnected connectors. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Clear the DTC for the rear vehicle monitoring control module using the M-MDS. (See CLEARING DTC [REAR VEHICLE MONITORING SYSTEM].) • Switch the ignition ON (engine off or on) and wait for 2.5 s or more. • Retrieve the rear vehicle monitoring control module DTCs using the M-MDS. (See DTC INSPECTION [REAR VEHICLE MONITORING SYSTEM].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the rear vehicle monitoring control module (RH). (See REAR VEHICLE MONITORING CONTROL MODULE REMOVAL/INSTALLATION.) Go to the next step.
6		No	Go to Step 8.
7	PERFORM DTC INSPECTION AND VERIFY REAR VEHICLE MONITORING CONTROL MODULE (LH) MALFUNCTION • Clear the DTC for the rear vehicle monitoring control module using the M-MDS. (See CLEARING DTC [REAR VEHICLE MONITORING SYSTEM].) • Switch the ignition ON (engine off or on) and wait for 2.5 s or more. • Retrieve the rear vehicle monitoring control module DTCs using the M-MDS. (See DTC INSPECTION [REAR VEHICLE MONITORING SYSTEM].) • Is the same DTC displayed?	Yes	Replace the rear vehicle monitoring control module (LH), then go to the next step. (See REAR VEHICLE MONITORING CONTROL MODULE REMOVAL/INSTALLATION.)
7		No	Go to the next step.
8	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 [REAR VEHICLE MONITORING SYSTEM].)
8		No	DTC troubleshooting completed.