DTC U0028:87 [REAR VEHICLE MONITORING SYSTEM]SM2446029
DTC U0028:87 [REAR VEHICLE MONITORING SYSTEM]

id0902z2886700

DESCRIPTION

Communication error between rear vehicle monitoring control module (LH) and (RH)
DETECTION CONDITION
• Communication error between rear vehicle monitoring control module (LH) and (RH) for 1 s or more.
POSSIBLE CAUSE
• Rear vehicle monitoring control module (LH) or (RH) connector or terminals malfunction
• Short to ground in wiring harness between the following terminals:
― Rear vehicle monitoring control module (LH) terminal L—Rear vehicle monitoring control module (RH) terminal C
― Rear vehicle monitoring control module (LH) terminal I—Rear vehicle monitoring control module (RH) terminal A
• Short to power supply in wiring harness between the following terminals:
― Rear vehicle monitoring control module (LH) terminal L—Rear vehicle monitoring control module (RH) terminal C
― Rear vehicle monitoring control module (LH) terminal I—Rear vehicle monitoring control module (RH) terminal A
• Open circuit in wiring harness between the following terminals:
― Rear vehicle monitoring control module (LH) terminal L—Rear vehicle monitoring control module (RH) terminal C
― Rear vehicle monitoring control module (LH) terminal I—Rear vehicle monitoring control module (RH) terminal A
• 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 CONNECTORS CONDITION
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable.
• Disconnect the rear vehicle monitoring control module (LH) and (RH) connectors.
• Inspect the connectors and terminals (corrosion, damage, pin disconnection).
• Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 5.
No
Go to the next step.
2
INSPECT CAN BUS CIRCUIT FOR SHORT TO GROUND
• 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 (LH) terminal L
― Rear vehicle monitoring control module (LH) terminal I
• Is there continuity?
Yes
Repair or replace the wiring harness for possible short to ground, then go to Step 5.
No
Go to the next step.
3
INSPECT CAN BUS CIRCUIT FOR SHORT TO POWER SUPPLY
• Rear vehicle monitoring control module (LH) and (RH) connectors are disconnected.
• Reconnect the negative battery cable.
• Turn the ignition switch to the ON position.
• Measure the voltage at the following terminals (wiring harness-side):
― Rear vehicle monitoring control module (LH) terminal L
― Rear vehicle monitoring control module (LH) terminal I
• Is there any voltage?
Yes
Repair or replace the wiring harness for possible short to power supply, then go to Step 5.
No
Go to the next step.
4
INSPECT CAN BUS CIRCUIT FOR OPEN CIRCUIT
• Rear vehicle monitoring control module (LH) and (RH) connectors are disconnected.
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable.
• Inspect for continuity between the following terminals (wiring harness-side):
― Rear vehicle monitoring control module (LH) terminal L—Rear vehicle monitoring control module (RH) terminal C
― Rear vehicle monitoring control module (LH) terminal I—Rear vehicle monitoring control module (RH) terminal A
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for possible open circuit, then go to the next step.
5
VERIFY REAR VEHICLE MONITORING CONTROL MODULE (RH) MALFUNCTION
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the rear vehicle monitoring control module using the M-MDS. (See CLEARING DTC [REAR VEHICLE MONITORING SYSTEM].)
• Turn the ignition switch to the ON position.
• Perform the “DTC INSPECTION” to confirm the rear vehicle monitoring system DTC using the M-MDS. (See DTC INSPECTION [REAR VEHICLE MONITORING SYSTEM].)
• Is the same DTC present?
Yes
Replace the rear vehicle monitoring control module (RH), then go to the next step.
(See REAR VEHICLE MONITORING CONTROL MODULE REMOVAL/INSTALLATION.)
No
Go to Step 7.
6
VERIFY TROUBLESHOOTING COMPLETED
• Clear the DTC from the rear vehicle monitoring control module using the M-MDS. (See CLEARING DTC [REAR VEHICLE MONITORING SYSTEM].)
• Turn the ignition switch to the ON position.
• Perform the “DTC INSPECTION” to confirm the rear vehicle monitoring system DTC using the M-MDS. (See DTC INSPECTION [REAR VEHICLE MONITORING SYSTEM].)
• Is the same DTC present?
Yes
Replace the rear vehicle monitoring control module (LH), then go to the next step.
(See REAR VEHICLE MONITORING CONTROL MODULE REMOVAL/INSTALLATION.)
No
Go to the next step.
7
VERIFY THAT NO OTHER DTCs ARE PRESENT
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [REAR VEHICLE MONITORING SYSTEM].)
No
DTC troubleshooting completed.