Steering Column Switches: Other GMC Envoy I

BRAKE TRANSMISSION SHIFT INTERLOCK (BTSI) ACTUATOR

1. Move actuator rod to adjuster block side for leverage. Press on adjuster block to compress internal adjuster spring and disengage adjuster teeth. Slide adjuster block as far away from solenoid as possible. Replace actuator rod to solenoid side.
2. Check BTSI operation. Actuator must lock gearshift lever whenever steering column is in PARK position and when trying to shift from PARK position with key in RUN position without brake pedal depressed. Ensure gearshift lever releases with key in RUN position and brake pedal depressed. Readjust if needed.

Guide Clip Type

1. Position shift lever in Neutral. Position guide clip on edge of shift bowl to centrally position pointer on "N" position. Push clip onto bowl. Ensure cable rests on bowl and not on column jacket.
2. Move shift lever through all positions, then back to Neutral. Ensure pointer covers a portion of each graphic, or flag fills entire window for each graphic.

Column Shift

Ensure gear shift lever is in Park. Turn lock cylinder to OFF-LOCK position and remove key. Using Park Lock Cable Pliers (J-41396), unlock adjuster ring on cable assembly. Pull on cable until park lock latch contacts gear shift lever. Release cable. Using park lock cable pliers, lock adjuster ring securely in place.

HORN SYSTEMS

Before performing any test on horn system, check the following items to eliminate common problems

1. Check for open horn fuse.
2. Check for damaged, loose or corroded connections.
3. Check for damaged wiring harness.
4. Check for proper installation of aftermarket electronic equipment which may affect circuits.

If fuse is blown, repair short to ground in Orange or Dark Green wire. Correct any obvious problems before continuing testing. If problem still exists, identify horn symptom and perform appropriate test. See SYSTEM TESTING .

IGNITION SWITCH

Turn ignition off. Disconnect steering column switch 48-pin connector located on steering column. Using DVOM, check for continuity between specified terminals with ignition switch in specified position. See appropriate IGNITION SWITCH CONTINUITY TEST table. (Scheme 7) If continuity does not exist as indicated, repair as necessary.

IGNITION SWITCH CONTINUITY TEST

Scheme 7

TURN SIGNAL/HAZARD SWITCH

Turn ignition off. Disconnect steering column switch 48-pin connector located on steering column. Using DVOM, check for continuity between specified terminals with turn signal/hazard switch in specified position. See appropriate TURN SIGNAL/HAZARD SWITCH CONTINUITY TEST table. (Scheme 7) If continuity does not exist as indicated, repair as necessary.

TURN SIGNAL/HAZARD SWITCH CONTINUITY TEST

HORN SYSTEM

Horns Inoperative

1. Connect test light between ground and horn relay terminal C3 (Orange wire). Connect test light between ground and horn relay terminal C4 (Orange wire). If test light illuminates in both positions, go to next step. If test light does not illuminate in both positions, repair open in appropriate Orange wire between horn relay and instrument panel fuse block.
2. Connect test light between horn relay terminals C4 (Orange wire) and A3 (Black wire). Press horn button. If test light illuminates, go to next step. If test light does not illuminate, go to step 4).
3. Connect a fused jumper wire between horn relay terminals C4 (Orange wire) and A4 (Dark Green wire). If horns do not sound, go to step 5). If horns sound, replace horn relay.
4. Connect test light between horn relay terminal C3 (Orange wire) and horn slip ring connector. Press horn button. If test light does not illuminate, replace horn switch. If test light illuminates, repair open in Black wire between horn relay and horn switch.
5. Using DVOM, check for continuity between horn relay terminal A4 (Dark Green wire) and horn connector terminal "B" (Dark Green wire). If continuity exists, go to next step. If continuity does not exist, repair open in Dark Green wire between horn relay and horn.
6. Check for continuity between ground and each horn connector terminal "A" (Black wire). If continuity exists, replace both horns. If continuity does not exist, repair open in Black wire between horn and ground.

Horns Sound At All Times

1. Remove horn relay, located in relay center behind glove box. If horns stop sounding, go to next step. If horns do not stop sounding, repair short to voltage in Dark Green wire between horn relay and horn.
2. Connect test light between horn relay terminals C3 (Orange wire) and A3 (Black wire) at relay center. If test light illuminates, go to next step. If test light does not illuminate, replace horn relay.
3. Disconnect horn switch. If test light does not illuminate, replace horn switch. If test light illuminates, repair short to ground in Black wire between horn relay and horn switch.

One Horn Inoperative

1. Disconnect inoperative horn. Connect test light between ground and horn harness terminal "B" (Dark Green wire). Press horn button. If test light illuminates, go to next step. If test light does not illuminate, repair open in appropriate Dark Green wire between horn and horn relay.
2. Connect test light between inoperative horn harness connector terminals "B" (Dark Green wire) and "A" (Black wire). If test light does not illuminate, repair open in Black wire between horn and ground. If test light illuminates, check for poor connections at horn. If connections are okay, replace horn.

Fuse Blows When Horn Button Is Pressed

1. Replace CTSY fuse (20-amp) located in instrument panel fuse block. Disconnect horn connector terminal "B" (Dark Green wire) from both horns. Press horn button. If fuse is okay, go to next step. If fuse blows again, repair short to ground in Dark Green wire between horn relay and horns.
2. Reinstall right horn. Press horn button. If fuse blows, replace right horn. If fuse does not blow, replace left horn.