| 1 |
- Are all illumination on the audio unit turned OFF?
|
Yes |
Go to the next step. |
| No |
Replace the audio unit.
(See AUDIO UNIT REMOVAL/INSTALLATION
.) |
| 2 |
- Switch the ignition OFF (LOCK).
- Inspect the fuse (ILLUMI).
- Is the fuse normal?
|
Yes |
Go to Step 4. |
| No |
Go to the next step. |
| 3 |
- Disconnect the audio unit connector (24-pin) and inspect the continuity between the audio unit wiring harness-side connector terminal 1E (TNS) and the ground.
- Is there continuity?
|
Yes |
Repair or replace the short circuit in the suspect wiring harness. After repair the harness, replace with the appropriate standard fuse. |
| No |
Go to the next step. |
| 4 |
- Inspect the connection of the audio unit connector (24-pin).
- Inspect both the audio unit and wiring harness-side connector terminal 1E for poor connection (such as damaged/pulled-out pins, corrosion).
- Are all the pins normal?
|
Yes |
Go to the next step. |
| No |
If poor connection of audio unit connector:
- Securely connect the audio unit connector.
If the audio unit side connector is wrong:
- Replace the audio unit.
(See AUDIO UNIT REMOVAL/INSTALLATION
.)
If the wiring harness-side connector is wrong:
- Repair or replace the pins and/or the connector.
|
| 5 |
- Connect the audio unit connector (24-pin).
- Switch the ignition to ACC.
- Inspect the voltage at the audio unit connector terminal 1E (TNS).
- Is the voltage B+ when the light switch is turned to the TNS position?
|
Yes |
Replace the audio unit.
(See AUDIO UNIT REMOVAL/INSTALLATION
.) |
| No |
Repair or replace the suspect wiring harness (TNS signal). |