DTC B1873 [BCM]
id0902f5832200
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DTC B1873 |
Hazard warning switch input circuit short to ground |
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DETECTION CONDITION
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Short to GND in wiring harness between BCM and hazard warning switch
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POSSIBLE CAUSE
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• Short to GND in wiring harness between BCM terminal 5M and hazard warning switch terminal A
• Hazard warning switch malfunction
• BCM malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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INSPECT HAZARD WARNING SWITCH CONNECTOR
• Disconnect the hazard warning switch connector.
• Inspect the hazard warning switch connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the terminal, then go to Step 5.
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No
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Go to the next step.
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2
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INSPECT BCM CONNECTOR
• Disconnect the BCM connector.
• Inspect the BCM connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the terminal, then go to Step 5.
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No
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Go to the next step.
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3
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INSPECT HAZARD WARNING SWITCH SIGNAL CIRCUIT FOR SHORT TO GND
• Inspect for continuity between BCM terminal 5M (wiring harness-side) and body GND.
• Is there continuity?
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Yes
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Repair or replace the wiring harness for a possible short to GND, then go to Step 5.
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No
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Go to the next step.
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4
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INSPECT HAZARD WARNING SWITCH
• Inspect the hazard warning switch.
• Is there any malfunction?
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Yes
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Replace the hazard warning switch, then go to the next step.
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No
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Go to the next step.
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5
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VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the BCM memory using the M-MDS.
• Perform the BCM DTC inspection.
(See DTC INSPECTION [BCM].)
• Is the same DTC present?
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Yes
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Replace the BCM.
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No
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DTC troubleshooting completed.
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