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