DTC B1873 [BCM]SM2445883
DTC B1873 [BCM]

id0902f5832200

DTC B1873

Hazard warning switch input circuit short to ground
DETECTION CONDITION
• Short to ground in wiring harness between BCM and hazard warning switch
POSSIBLE CAUSE
• Hazard warning switch connector or terminal malfunction
• BCM connector or terminal malfunction
• Short to ground in wiring harness between BCM terminal 3T and hazard warning switch terminal C
• Hazard warning switch malfunction
• BCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT HAZARD WARNING SWITCH CONNECTOR CONDITION
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable.
• Disconnect the hazard warning switch connector.
• Inspect the connector and terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the connector and/or terminal, then go to Step 5.
No
Go to the next step.
2
INSPECT BCM CONNECTOR CONDITION
• Disconnect the BCM connector.
• Inspect the connector and terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the connector and/or terminal, then go to Step 5.
No
Go to the next step.
3
INSPECT HAZARD WARNING SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND
• Hazard warning switch and BCM connectors are disconnected.
• Inspect for continuity between hazard warning switch terminal C (wiring harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 5.
No
Go to the next step.
4
INSPECT HAZARD WARNING SWITCH
• Inspect the hazard warning switch. (See HAZARD WARNING SWITCH INSPECTION.)
• Is there any malfunction ?
Yes
Replace the hazard warning switch, then go to the next step.
(See HAZARD WARNING SWITCH REMOVAL/INSTALLATION.)
No
Go to the next step.
5
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the BCM using the M-MDS. (See CLEARING DTC [BCM].)
• Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].)
• Is the same DTC present?
Yes
Replace the BCM.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.