| 1. | Turn the ignition switch ON (II). |
| 2. | Turn the combination lighting switch ON and OFF to see if the symptom can be duplicated. Is it duplicated? YES - Go to 3. NO - Operation is normal.n |
| 3. | Turn the combination light switch OFF. |
| 4. | Operate the illumination control dial. Is it normal? YES - Operation is normal.n NO - Go to 5. |
| 5. | Disconnect and check audio unit connector A (17P) for loose or a poor connection. Reconnect audio unit connector A (17P) and recheck the symptom; does it still appear? YES - Go to 6. NO - Operation is normal.n |
| 6. | Measure the voltage between audio unit connector A (17P) No. 1 and No. 10 terminals. Operate the dash brightness controler buttons to see if the voltage change.
Does the voltage change? YES - Substitute a known-good audio unit, and recheck. If the symptom/indication goes away, replace the original audio unit. If symptom is still present, substitute a known-good center panel display and recheck. If the symptom/indication goes away, replace the original center panel display.n NO - Repair the open in the wire between the under-dash fuse/relay box and the gauge control module.n |