POOR RADIO RECEPTION NOISE/ST (REPL. RADIO ANTENNA CAB & BD)

Subject: POOR RADIO RECEPTION NOISE/STATIC

Model and Year: 1988-93 C/K TRUCKS

THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 93-239-9A DATED JUNE 1993. THE VIN BREAKPOINTS HAVE BEEN ADDED. ALL COPIES OF 93-239-9A SHOULD BE DISCARDED.

CONDITION:

--------- Owners of some 1988-93 C/K trucks may comment about poor radio reception or static.

CAUSE:

----- Water intrusion through the antenna base. The sealing compound contained in the antenna base may separate thus allowing water to enter the antenna base and from there migrate along the antenna cable. Usually, the separation cannot be seen by a visual inspection.

CORRECTION:

---------- Uncouple the connection where the antenna cable and antenna cable extension meet (Figure 1). Check for the presence of moisture, corrosion, or other signs of water intrusion. If there is any sign of moisture at the connector, replace the antenna cable and body assembly (P/N 15963441). If water intrusion is present, it will also be necessary to replace the antenna extension cable between the antenna body terminal and radio receiver. (See Figures 1 and 2.)

Vehicles built after the following VIN breakpoints are equipped with the new antenna base:

PLANT VIN PLANT VIN ----- --- ----- --- Oshawa P1227515 Ft Wayne PZ221840 Janesville PJ383300 Pontiac East PE247979

SERVICE PARTS INFORMATION:

PART DESCRIPTION QTY ---- ----------- --- 15963441 Antenna cable and body 1 assembly 15573236 Antenna Cable Extension 1

Parts are currently available from GMSPO.

WARRANTY INFORMATION:

For vehicles repaired under warranty, use:

LABOR OP DESCRIPTION TIME -------- ----------- ---- R0240 Replace Antenna Cable See and Body Assembly Applicable R0260 Replace Antenna Labor Time Extension Cable Guide

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.