2003 GMC Sierra Faulty Turn Signal Switch

1234JOHN

MEMBER
2003 GMC SIERRA
V8
2WD
AUTOMATIC
54,000 MILES

Two items please -

1) It appears that I need a special tool to take the base of the steering column down to access the faulty turn signal switch embedded in the steering column. Where do I get this tool or is there a simple tool that will suffice.

2) The symptom, upon pushing the left turn signal on, the hazard flashers go on instead of just the left signal. The right turn signal works fine. It appears I have a faulty turn signal switch - is this just one module or an entire assembly of switches?

Thank you for your feedback. John

1 Reply

DAVE H

MECHANIC
13,384 POSTS

This is a standard steering column without column shift lever .. which part are you trying to replace ? let me know if you have a column shift i will supply the diagram for you ? there are lean shift and standard shift columns ??

Multifunction, Turn Signal Switch Replacement
Removal Procedure
CAUTION:Refer to SIR CAUTION .

Disable the SIR system. Refer to ZONE 3 .
Remove the upper and lower trim covers. Refer to Steering Column Trim Covers Replacement .
IMPORTANT:The abrasion sleeve located on the steering column wire harness assembly must be reinstalled. Make note of what connector is coming out of the abrasion sleeve for installation purposes.

Remove the wire harness assembly (1) from the wire harness strap (2).
Fig. 54: Remove Wire Harness Assembly From Wire Harness Strap
Courtesy of GENERAL MOTORS CORP.
Disconnect the turn signal and multifunction switch assembly connector from the SIR system coil connector.
Slide the 2 connectors (2) of the turn signal and multifunction switch assembly out of the bulkhead connector (1).
Fig. 55: Slide Turn Signal & Multifunction Switch Assembly Connectors Out Of Bulkhead Connector
Courtesy of GENERAL MOTORS CORP.
Remove the 2 pan head tapping screws (1) and (3) from the turn signal and multifunction switch assembly (2).
Remove the turn signal and multifunction switch assembly (2) from the steering column tilt head assembly.
Fig. 56: Pan Head Tapping Screws & Turn Signal & Multifunction Switch Assembly
Courtesy of GENERAL MOTORS CORP.
Installation Procedure
Install the turn signal and multifunction switch assembly (2) onto the steering column tilt head assembly.
NOTE:Refer to FASTENER NOTICE .

IMPORTANT:Be sure that the electrical contact of the turn signal and multifunction switch assembly (2) rests on the turn signal cancel cam assembly.

Screw the 2 pan head tapping screws (1) and (3) into the turn signal and multifunction assembly (2).
Tighten
Tighten the top pan head tapping screw (1) to 3 N.m (30 lb in).
Tighten the side pan head tapping screw (3) to 7 N.m (62 lb in).
Fig. 57: Pan Head Tapping Screws & Turn Signal & Multifunction Switch Assembly
Courtesy of GENERAL MOTORS CORP.
Slide the 2 connectors (2) of the turn signal and multifunction switch assembly into the bulkhead connector (1).
Fig. 58: Slide Connectors Of Turn Signal & Multifunction Switch Into Bulkhead Connector
Courtesy of GENERAL MOTORS CORP.
Connect the turn signal and multifunction switch assembly connector to the SIR coil connector.
IMPORTANT:The abrasion sleeve must be installed back onto the steering column wire harness assembly. The ignition lock cylinder case wires and connector must be hanging out of the middle of the abrasion sleeve.

Install the wire harness assembly (1) into the wire harness strap (2).
Install the upper and lower trim covers. Refer to Steering Column Trim Covers Replacement .
Enable the SIR system. Refer to ZONE 3 .