Test D: Air Bag Diagnostic Monitor Communication Fault
- Disable air bag system. See AIR BAG RESTRAINT SYSTEM article. Disconnect air bag diagnostic monitor Black 12-pin connector C277 (located behind instrument panel on tunnel of floorpan). Measure resistance in Light Blue/White wire between air bag diagnostic monitor connector C277 pin No. 12 and DLC pin No. 7. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair Light Blue/White wire. Reconnect connectors. Reactivate air bag system. Repeat DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS.
- With air bag diagnostic monitor Black 12-pin connector C277 disconnected, inspect connector C277 pin No. 12 and wire connection. If pin No. 12 and wire connection are okay, go to next step. If pin No. 12 or wire connection is not okay, service connector C277. Reconnect connectors. Reactivate air bag system. Repeat DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS .
- Inspect DLC pin No. 7 for damage or bad wire connection. If pin and wire connection are okay, replace air bag diagnostic monitor. If pin or wire connection is damaged, service DLC. Reconnect connectors. Repeat DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS.