SERVICE MANUAL UPDATE ELECTRICAL DIAGNOSIS

MODELS AFFECTED: 1988 LESABRE & ELECTRA ESTATE WAGONS

The following pages reflect corrections and/or product changes. These pages are contained herein:

8A-12-1 Light Switch Details 8A-12-3 8A-66-0-A Air Conditioning 8A-67-1-A Air Conditioning 8A-110-1 Exterior Lights 8A-110-2 8A-112-0 Backup Lights 8A-118-0 Trailer Adapter 8A-118-1 8A-130-1-A Tailgate Power Lock

TRAILER ADAPTER: U94

COMPONENT LOCATION

Auxiliary Connector LH rear corner of cargo compartment 201-9-A Brake Switch On brake pedal support 201-3-D Fuse Block Behind LH side of I/P, near shroud 201-4-A Trailer Adapter Behind license plate 201-9-A Turn Flasher At base of steering column, behind I/P 201-8-A C104 (11 cavities) Attached to RH side of steering column 201-8-A C209 (11cavities) Body connector, on RH side of Fuse Block 201-4-D C214 (8 cavities) LH rear corner of cargo compartment 201-9-A C550 (3 cavities) In LH rear corner of cargo compartment 201-14-A C551 (3 cavities) In RH rear corner of cargo compartment 201-14-A G245 Behind LH tail light assembly 201-13-D S427 I/P harness, above Fuse Block 201-4-A S499 Rear lights harness, LH rear corner of 201-14-A cargo compartment

HARNESS CONNECTOR FACES

(For all connector faces not shown, see page 202-0 or 110-0)

TROUBLESHOOTING HINTS

1. If car's Stop, Turn, or Tail Lights do not operate independently with the Trailer Adapter connected, check that ground G245 and trailer ground are clean and tight. Also check/repair WHT (22) wire.

2. Check that Trailer Adapter is properly mated.

3. If Trailer Stop/Turn/Hazard Lights do not operate, check vehicle's Stop/Turn/Hazard Lights operation. If OK, check/repair DK GRN (19) and YEL (18) wires to Trailer Adapter. Refer to Section 8A-110 if vehicle's Stop/Turn/Hazard Lights are inoperative.

4. If Trailer Tail Lights do not operate, check vehicle's Tail Light operation. If OK, check/repair BRN (9) wire to Trailer Adapter. Refer to Sectio 8A-110 if vehicle's Tail Lights are inoperative.

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.