1. Disconnect the gauge control module 30P connector.

1. Inspect the connector and socket terminals to be sure they are all making good contact.
   - If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
   - If the terminals are OK, go to Step 9 .

1. With the connectors still disconnected, make these input tests at the connector.
   - If any test indicates a problem, find and correct the cause, then recheck the system.
   - If the input tests prove OK, go to Step 10 .

   Cavity | Wire | Test condition | Test: Desired result | Possible cause if result is not obtained
   --- | --- | --- | --- | ---
   B20 | BLK | Under all conditions | Check for continuity to ground: There should be continuity. |
   - Poor ground (G501, G506)
   - An open in the wire

1. Perform the gauge self test procedure.
   - If the beeper sounds and the seatbelt light flashes, go to Step 11 .
   - If the beeper does not sounds, or the seatbelt light does not flash, replace the gauge control module.

1. Substitute a known-good under-dash fuse/relay box and recheck the system.
   - It the symptom is gone, the MICU is faulty; replace the under-dash fuse/relay box.
   - It the symptom is still present, the gauge control module is faulty; replace the gauge control module.