Audio System - AM Band Noise/Reception Concerns
T00992AM RADIO NOISE & RECEPTION PROBLEMS
APPLICABLE MODELS
1991 Navajo
DESCRIPTION
Static, station fading or engine noise interference on weak to moderate strength AM radio stations may be caused by the auto cruise control unit, or a faulty in-line connector for the antenna.
If the vehicle was built prior to February 28, 1991, the problem may be corrected by installing the new cruise control unit. This unit has been installed at production since February 28, 1991.
NOTE:
The following diagnostic procedures assume that during your test/validation process you have concluded that this symptom is abnormal and not related to a defective radio or antenna mast.
VIN OF PRODUCTION CHANGE
DIAGNOSTIC PROCEDURES
Auto Control Unit
Validate the problem by operating the vehicle using all cruise control functions. If static or fading occurs only when the cruise control is activated, and the vehicle was produced prior to February 28, 1991, the auto cruise control unit should be replaced with the new part.
If static, fading, or engine interference noise continues regardless of cruise control operation, it is possible that the in-line connector is causing the problem and should be replaced.
In-Line Cable Connector
Before replacing the in-line connector, perform the following:
1. Inspect cable connector at antenna base for corrosion. If corroded, clean with steel wool and remove steel wool particles.
2. Apply white lithium grease to female end of connector.
3. Retest.
4. If problem is still present, check in-line cable connector behind glove box for corrosion.
5. If corroded, clean cable ends as described in step 1.
6. Replace in-line cable connector (ZZL0 66 931) and reconnect cables.
7. Retest.
8. If problem is still present, replace antenna cables.
NOTE:
Be sure cables are routed away from blower motor. Blower motors can be a source of static.
PARTS INFORMATION
WARRANTY INFORMATION
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