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 13A |
| BUS SHORT TO 5 VOLTS | TEST 14A |
| BUS SHORT TO GROUND | TEST 15A |
| BUS (+) & BUS (-) SHORTED TOGETHER | TEST 16A |
| NO TERMINATION | TEST 17A |
| BUS BIAS LEVEL TOO LOW | TEST 18A |
| BUS BIAS LEVEL TOO HIGH | TEST 18A |
| BUS (+) OPEN | TEST 19A |
| BUS (-) OPEN | TEST 19A |
| NO BUS BIAS | TEST 4A |
| NOT RECEIVING BUS MESSAGES CORRECTLY | TEST 18A |
NO RESPONSE DIAGNOSIS
| Problem Module | Test No. | ||
|---|---|---|---|
| Air Bag Control Module | TEST 2A | ||
| Automatic Temperature Control | TEST 3A | ||
| Body Control Module (1) | TEST 4A | ||
| Compass/Mini-Trip Module | TEST 5A | ||
| Driver Door Module | TEST 6A | ||
| Instrument Cluster | TEST 7A | ||
| Memory Seat Module | TEST 8A | ||
| Passenger Door Module | TEST 9A | ||
| Powertrain Control Module | TEST 10A | ||
| CCD Radio | TEST 11A | ||
| Vehicle Information Center | TEST 12A | ||
|
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NOTE:
For connector terminal identification, refer to CONNECTOR IDENTIFICATION
. For wiring diagrams, refer to WIRING DIAGRAMS
. After each repair, perform TEST VER-1A
.
CAUTION:
Always turn ignition off prior to disconnecting any module connector.