Column Switches

NOTE: Use following procedure to test lighting and wiper/washer systems. For additional testing procedures, see appropriate WIPER/WASHER SYSTEMS - FRONT article in ACCESSORIES & EQUIPMENT.

Turn ignition off. Disconnect Black 48-cavity steering column harness-to-main harness connector under instrument panel. To locate correct terminals of switch to be tested, see 48-CAVITY CONNECTOR TERMINAL IDENTIFICATION table. See appropriate article for circuit being tested in the ACCESSORIES/SAFETY EQUIPMENT Section for wiring diagram. Locate switch in wiring diagram.
Connector terminals represented in wiring diagram (identified by a letter/number combination) match connector terminals of 48-cavity connector illustrated. See Fig 1 .
Check continuity between appropriate terminals of 48-cavity connector according to selected switch position. If continuity is not correct for selected switch position, check for open in circuit between 48-cavity connector and switch. If circuit is okay, replace switch.

Fig 1: Identifying 48-Cavity Connector Terminals

Courtesy of GENERAL MOTORS CORP.

48-CAVITY CONNECTOR TERMINAL IDENTIFICATION⁽¹⁾

Cavity

Wire Color

Description

YEL

Fused Feed To HVAC

BLK

Ground To HVAC

DK GRN

Data: Radio, HVAC

GRY

Steering Wheel Illumination

BLK

Ground To G119

YEL

Fused Feed

BLK

Horn Switch

LT GRN

Key Chime

A10

TAN

Door Jam Switch

A11

DK BLU

Right Turn Signal

A12

DK GRN

Right Turn Light

A13

BRN

Hazard Flasher

A14

PPL

Turn Flasher

A16

YEL

Left Turn Light

A17

LT BLU

Left Turn Signal

PPL/WHT

IGN 3 Fuse

TAN/WHT

Bulb Test Ground

TAN

Low Beam Head Lights

LT GRN

Hi Beam Head Lights

YEL/BLK

Flash To Pass

YEL

B+ To Dimmer Sw.

BRN

B+ to ACCY 1 Fuse

BLU/WHT

Ignition Switch To "IGN 1"

RED

B+ to Ignition Switch

PNK

Ignition Switch to "IGN 1"

GRY

Cruise ENGAGE

DK BLU

Cruise SET/COAST

E12

PNK/BLK

Cruise Fused Feed

E13

GRY/BLK

Cruise RES/ACCEL

⁽¹⁾	Cavities not shown are NOT USED for testing