PINPOINT TEST B : The Horn Is Always On
- B1 CHECK THE BCM HORN OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: BCM C2280E .
- Ignition ON.
Does the horn continue to sound?
Yes REPAIR the circuit. No GO to B2. - B2 ISOLATE THE BCM
- Ignition OFF.
- Connect: BCM C2280E .
- Disconnect: BCM C2280B .
Does the horn continue to sound?
Yes GO to B6. No GO to B3. - B3 CHECK THE HORN SWITCH INPUT TO THE BCM CIRCUIT FOR A SHORT TO GROUND
- Disconnect: SCCM C2414A .
- Connect: BCM C2280B .
Does the horn continue to sound?
Yes REPAIR the circuit. No GO to B4. - B4 ISOLATE THE STEERING WHEEL AND HARNESS
- Connect: SCCM C2414A .
- Remove the driver air bag module. REFER to Supplemental Restraint System .
- Disconnect: Clockspring C218B .
- Connect the battery ground cable.
Does the horn continue to sound?
Yes GO to B5. No REPAIR the steering wheel harness for a short to ground or INSTALL a new steering wheel. REFER to Steering Column . - B5 CHECK THE CLOCKSPRING FOR A SHORT TO GROUND
- Remove the clockspring. REFER to Supplemental Restraint System .
Does the horn continue to sound?
Yes GO to B7. No INSTALL a new clockspring. REFER to Supplemental Restraint System . - B6 CHECK FOR CORRECT BCM OPERATION
- Disconnect and inspect all BCM connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the BCM connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new BCM. REFER to Multifunction Electronic Modules - Without Intelligent Access or REFER to Multifunction Electronic Modules - With Intelligent Access. . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. - B7 CHECK FOR CORRECT SCCM OPERATION
- Disconnect and inspect all SCCM connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the SCCM connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new SCCM. REFER to Steering Column Switches . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.