Question about 1999 GMC Suburban

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I have a 1999 suburban right side headlight problem when i turn my lights on from the inside dahs i seen that the right side turn singal was lit up im thinking time to change the bubles so i changed the rear turn singal and the front but still the same thing then i notice when the headlights on the right side are on it is lit real low while the left side is lit up like it supposed to be then when i push the horn with the lights on the right side get brighter then when i turn the lights off and hit the horn the horn works just fine also when i unhook the right side light the right side turn singlas get bright like they should be so im lost on what to do here can someone please point me and the right place

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  • randy douglas
    randy douglas Apr 11, 2011

    i have a 1999 suburban right side headlight problem when i turn my lights on from the inside dahs i seen that the right side turn singal was lit up im thinking time to change the bubles so i changed the rear turn singal and the front but still the same thing then i notice when the headlights on the right side are on it is lit real low while the left side is lit up like it supposed to be then when i push the horn with the lights on the right side get brighter then when i turn the lights off and hit the horn the horn works just fine also when i unhook the right side light the right side turn singlas get bright like they should be so im lost on what to do here can someone please point me and the right place on my truck my light switch is on the dash board not the turn signal

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  • Master
  • 2,468 Answers

It is a ground problem due to these issues you just noted,you need to start at the relay box and disconnect this circuit or at the very end of this circuit and start from there and proceed forward to the relay/fuse box(as in the left hand turn signal) on this vehicle the right and left are on separate circuits,so it tells me your problem is on the left side circuit,and as you say when you push the horn button the headlights get brighter(POOR GROUNDING CIRCUIT) which says its making a better/lower resistance ground through this combination buss bar off the same circuit breaker,also check the turn signal flasher located behind the dash board near the drivers door panel up front

Posted on Apr 11, 2011

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  • GMC Master
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Hello
Without being there to see this problem 1st hand diagnosis will be based on what problems I know cause these types electrical problems. The first theng i would do here is pull the **** shell covers off the steering column and check for any burnt wiring, this has been a source of similiar problems in other Suburbans. If wiring and connector pins to the Combination switch (this is the turn signal switch) look ok and are not discolored from heat then it is likely the combination switch is defective. Circuits are cross feeding insiode the switch due to heat damage most likely, that is why the seeminly crazy symptoms you have. The Combination switch is expensive and i think you should have a shop check this before repalceing the switch. Before you start any work discnnect the battery negative cable. Here are the instructions for replacing the switch.
Refer to this picture for exploded view of the whole assembly. You will need access to a scanner to reset the SRS (Airbag).


Posted on Apr 08, 2011

  • yadayada
    yadayada Apr 08, 2011





    Fig. 2: Exploded view of the combination switch-1996 and later models


    CAUTION

    These models are equipped with a Supplemental Restraint System (SRS), which uses an air bag. Whenever working near any of the SRS components, such as the impact sensors, the air bag module, steering column and instrument panel, disable the SRS, as described in .


    1. Disconnect the negative battery cable.

    Make sure that the turn signal switch is in the OFF (center) position.


    1. Disable the Supplemental Inflatable Restraint (SIR) system. For details, please refer to the procedure located in of this repair guide.

    2. Remove the steering wheel.

    3. Remove the two pan head tapping screws from the lower steering column cover, then tilt the cover down and slide it back to disengage the locking tabs.

    4. Remove the lower steering column cover.

    5. Using a Torx® screwdriver, remove the two Torx head screws from the upper steering column cover, then remove the cover.

    6. Remove the wire harness strap, then remove the two harness straps from the steering column wire harness.

    7. Remove the screw and disengage the steering column bulkhead connector from the vehicle wiring harness.

    8. Unplug the gray and black connectors of the switch from the steering column bulkhead connector.

    9. Remove the two pan head tapping screws.

    10. Grasp the lever/multi-function turn signal switch assembly, then remove it by carefully pulling it straight outward.
    To install:


    1. Install the lever/multi-function turn signal switch assembly, using a small blade screwdriver to compress the electrical contact and move the assembly into position.

    The electrical contact MUST rest on the canceling cam assembly.


    1. Connect the two pan head tapping screws, then tighten the screws to 53 inch lbs. (6 Nm).

    2. Attach the gray and black connectors of the switch to the column bulkhead connector.

    3. Connect the steering column bulkhead connector to the vehicle wiring harness.

    4. Connect the two wire harness straps to the steering column wire harness, then install the wire harness strap.

    5. Install the upper steering column cover, then using a Torx® screwdriver, connect the two Torx head screws to the upper column cover, tighten to 12 inch lbs. (1.4 Nm).

    6. Install the lower steering column cover, then connect using the two pan head tapping screws, tighten to 53 inch lbs. (6 Nm).

    7. Make sure that the lever is in the OFF (center) position.

    8. Install the steering wheel.

    9. If equipped, install the horn pad.

    10. Activate the Supplemental Inflatable Restraint (SIR) system. For details, please refer to the procedure located in .

    11. Connect the negative battery cable.


    Read more: Chevy Questions - How do you replace the turn signal switch on a 1999 Chevy S-10 - JustAnswer http://www.justanswer.com/chevy/1wdyh-re...

  • yadayada
    yadayada Apr 08, 2011

    Instructions courtesy of Justanswer.com

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