DTC B2753: Horn Relay Coil Circuit High: Testing
WARNING: This page is about a different car, the 1999 Pontiac Grand Am and 1999 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If circuit is shorted to ground, fuse will blow. Check fuse before performing diagnostics.
- Perform BCM DIAGNOSTIC SYSTEM CHECK under SYSTEM TESTS. Go to next step.
- Replace horn relay with a known-good relay. Using scan tool, activate horn relay. If horn relay activates, go to step 10 . If horn relay does not activate, go to next step.
- Remove horn relay from underhood junction block. Disconnect underhood junction block connector C3. Using DVOM, measure voltage between underhood junction block connector C3 terminal C12 (Black wire) and ground. See WIRING DIAGRAMS . If zero volts is indicated, go to step 5 . If any voltage is indicated, go to next step.
- Replace underhood junction block. After repairs, go to step 10 .
- Disconnect BCM connector C1. Using DVOM, measure voltage between BCM connector C1 terminal A4 (Black wire) and ground. See Figure . If zero volts is indicated, go to step 7 . If any voltage is indicated, go to next step.
- Repair short to battery voltage in Black wire between BCM, horn switch and underhood junction block. After repairs, go to step 10 .
- Using DVOM, measure voltage between BCM connector C1 terminal A4 and (Black wire) and ground. If zero volts is indicated, go to step 9 . If any voltage is indicated, go to next step.
- Replace headlight/turn signal switch assembly. See appropriate STEERING COLUMN SWITCHES article. After repairs, go to step 10 .
- Replace BCM. See BODY CONTROL MODULE under REMOVAL & INSTALLATION. After repairs, go to next step.
- Using scan tool, clear DTCs. Go to BCM DIAGNOSTIC SYSTEM CHECK under SYSTEM TESTS.