Audio System - Inoperative/Speaker Noise

BULLETIN NUMBER:
SB98-13-L007

ISSUE DATE:
NOVEMBER 1998

GROUP:
ACCESSORIES

1998 RODEO (UE) & AMIGO (UA) AUDIO SYSTEM: SHORTING OF TWEETER HARNESS

AFFECTED VEHICLES
1999 Rodeo (UE) and Amigo (UA) models equipped with 6-speaker audio system.

SERVICE INFORMATION

Condition:
On some affected vehicles, the audio system may become inoperative or not fully functional, associated with noises coming from the speaker(s). The following is a list of the possible symptoms.

- No sound.
- Audio cuts in and out intermittently.
- Audio distortion from speaker unit(s).
- Sound level fluctuates, fades in/out.
- No power to head unit (radio).

NOTE
All Genuine Isuzu audio system head units incorporates protection circuitry. The purpose of the protection circuitry is to protect the unit from damage due to shorting of the speaker wire harness. When speaker short occurs, the protection circuit activates immediately and shuts off the amplifier operation until the short circuit is removed. Intermittent audio output is an indication of the protection circuitry being activated.

Possible Cause:
This condition may be the result of damage to the front left and/or right tweeter speaker wire harness when the door panel was installed onto the vehicle. This damage of the speaker wire harness may cause the wire to short, leading to the activation of the head unit's protection circuitry.

Correction:
To eliminate this condition, inspect the tweeter harness for damage. If damage is evident, repair and reroute the harness, to prevent future damage when re-installing the door panel.

PARTS INFORMATION

Replace parts as necessary.

WARRANTY CLAIM INFORMATION





Use the published labor operation:
Labor Time includes administrative time allowance.



SERVICE PROCEDURE

1. Record all radio station presets and disconnect the negative terminal of the battery.
2. If failure of only one side is determined, remove the front door panel of that side and skip to Step 4.
3. Remove both driver and passenger side front door panels.








4. Examine the tweeter harness for short or exposed wires. (Figure 1 and Figure 2)

- Driver's side: 2 wires leading to connection D-4.
- Passenger's side: 2 wires leading to connection D-13.

Refer to Electrical Trouble Shooting Manual for detailed circuit schematic information.

5. Repair wire(s) as necessary.
6. When re-installing door panel, use caution to prevent damage to the harness and route harness away from any door or door panel edges.

NOTE
Prior to installation, the excess slack of the tweeter harness may be taped away from the edges of the door panel or clips.

7. Reconnect the negative terminal of the battery, and reset the radio presets and the clock.
8. Test the audio system to confirm proper audio operation.
9. If any audio operation is incorrect or inoperative, inspect the fuse.
10. If the fuse is not open, return the head unit for repair.