| DTC B1906: | Immobilizer-Keyless Control Unit Lost Communication with Gauge Control Module (A/T Message) |
| 1. | Clear the DTCs with the HDS. |
| 2. | Turn the ignition switch OFF, and then back ON (II). |
| 3. | Wait for 6 seconds or more. |
| 4. | Check for DTCs with the HDS. Is DTC B1906 indicated? YES - Go to 5. NO - Intermittent failure, the gauge control module (tach) is OK at this time. Check for loose or poor connections at the gauge control module (tach) 36P connector and at the immobilizer-keyless control unit 7P connector.n |
| 5. | Turn the ignition switch OFF. |
| 6. | Select the BODY ELECTRICAL system select menu, then enter the UNIT INFORMATION menu. |
| 7. | Check the condition of the gauge control module (tach) from the CONNECTED UNIT list. Is NOT AVAILABLE indicated? YES - Go to 8. NO - Replace the immobilizer-keyless control unit.n |
| 8. | Do the gauge control module (tach) input test. Are all inputs OK? YES - Go to 9. NO - Repair the faulty input, then recheck the DTCs.n |
| 9. | Disconnect the under-dash fuse/relay box connector Q (16P). |
| 10. | Disconnect the gauge control module (tach) 36P connector. |
| 11. | Check for continuity between the under-dash fuse/relay box connector Q (16P) No. 6 terminal and gauge control module (tach) 36P connector No. 21 terminal.
Is there continuity? YES - Replace the gauge control module (tach).n NO - Repair an open in the wire between the immobilizer-keyless control unit and the gauge control module (tach).n |