Test 1A - Bus Fault Messages
Battery must be fully charged before proceeding. Connect scan tool to Data Link Connector (DLC) to retrieve messages. See BUS FAULT MESSAGES table and proceed to appropriate test number. If NO RESPONSE message is displayed, see NO RESPONSE DIAGNOSIS table and proceed to appropriate test number.
BUS FAULT MESSAGES
| Fault Messages | Test No. |
|---|---|
| BUS SHORT TO BATTERY | 12A |
| BUS SHORT TO 5 VOLTS | 13A |
| BUS SHORT TO GROUND | 14A |
| BUS (+) & BUS (-) SHORTED TOGETHER | 15A |
| NO TERMINATION | 16A |
| BUS BIAS LEVEL TOO LOW | 17A |
| BUS BIAS LEVEL TOO HIGH | 17A |
| BUS (+) OPEN | 18A |
| BUS (-) OPEN | 18A |
| NO BUS BIAS | 3A |
| NOT RECEIVING BUS MESSAGES CORRECTLY | 17A |
NO RESPONSE DIAGNOSIS
| Problem Module | Test No. | ||
|---|---|---|---|
| Air Bag Control Module | 2A | ||
| Body Control Module (1) | 3A | ||
| Compass/Mini-Trip Module | 4A | ||
| Driver Door Module | 5A | ||
| Instrument Cluster | 6A | ||
| Memory Seat Module | 7A | ||
| Passenger Door Module | 8A | ||
| Powertrain Control Module | 9A | ||
| CCD Radio | 10A | ||
| Vehicle Information Center | 11A | ||
|
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NOTE:
For connector terminal ID, see CONNECTOR IDENTIFICATION
and WIRING DIAGRAM
. After each repair, perform VERIFICATION TEST VER-1.
CAUTION:
Always turn ignition off prior to disconnecting any module connector.