DTC U0028:87 [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM]
id09021c399500
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DETECTION CONDITION
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No communication with BCM
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POSSIBLE CAUSE
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• Connector or terminal malfunction
• Short to ground in wiring harness between BCM terminal 6J and keyless control module terminal 2F
• Open circuit in wiring harness between BCM terminal 6J and keyless control module terminal 2F
• BCM malfunction
• Keyless control module malfunction
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Diagnostic Procedure
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Step |
Inspection |
Action |
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1
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INSPECT BCM CONNECTOR
• Switch the ignition to off.
• Disconnect the negative battery cable.
• 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?
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Yes
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Go to the next step.
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No
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Repair or replace the connector, then go to Step 6.
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2
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INSPECT KEYLESS CONTROL MODULE CONNECTOR
• Disconnect the keyless control module connector.
• Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
• Is the connector normal?
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Yes
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Go to the next step.
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No
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Repair or replace the connector, then go to Step 6.
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3
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INSPECT FOR SHORT TO GROUND IN WIRING HARNESS BETWEEN BCM AND KEYLESS CONTROL MODULE
• Verify that the BCM connector and keyless control module connectors are disconnected.
• Inspect for continuity between BCM terminal 6J (wiring harness-side) and body ground.
• Is there continuity?
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Yes
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Refer to the wiring diagram and verify whether or not there is a common connector between keyless control module terminal 2F and BCM terminal 6J.
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.
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No
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Go to the next step.
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4
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INSPECT FOR OPEN CIRCUIT IN WIRING HARNESS BETWEEN BCM AND KEYLESS CONTROL MODULE
• Verify that the BCM and keyless control module connectors are disconnected.
• Inspect for continuity between keyless control module terminal 2F (wiring harness-side) and BCM terminal 6J (wiring harness-side).
• Is there continuity?
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Yes
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Go to the next step.
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No
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Refer to the wiring diagram and verify whether or not there is a common connector between keyless control module terminal 2F and BCM terminal 6J.
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 6.
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5
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PERFORM DTC INSPECTION AND VERIFY BCM MALFUNCTION
• Make sure to reconnect all disconnected connectors.
• Reconnect the negative battery cable.
• Clear the DTC for the keyless control module using the M-MDS.
• Retrieve the keyless control module DTCs using the M-MDS.
• Is the same DTC displayed?
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Yes
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Replace the BCM, then go to the next step.
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No
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Go to Step 7.
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6
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VERIFY THAT REPAIRS HAVE BEEN COMPLETED
• Make sure to reconnect all disconnected connectors.
• Reconnect the negative battery cable.
• Clear the DTC for the keyless control module using the M-MDS.
• Retrieve the keyless control module DTCs using the M-MDS.
• Is the same DTC displayed?
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Yes
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Repeat the inspection from Step 1.
• If the malfunction recurs, replace the keyless control module.
Go to the next step.
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No
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Go to the next step.
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7
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VERIFY IF OTHER DTCs DISPLAYED
• Are any other DTCs displayed?
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Yes
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Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
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No
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DTC troubleshooting completed.
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