Question about 2005 GMC Yukon Xl Denali

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No left turn signal

Is there a electronic lighting control module and if so where is it located? I have no left turn signal both bulbs are good the fuse is good the right side works fine even when I put the flashers on the left will not work but the right does? please help

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In these newer cars they have installed separate fuses one for each side see if that is the case, if it is problem solved. If not you will need to check the line with a meter to see if you have any power going to the light area . If that's the case hook a hot lead of the turn signal and trace it backwards. Have you also changed the flasher unit. If not try it.

Posted on Apr 20, 2014


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2000 lincoln continental signal and hazard blinking lights not blinking

Do you know what a lighting control module is ?
Turn Signal and Hazard Lamps The turn signal system consists of:
  • turn signal miniature bulbs (13465)
  • lighting control module
  • multi-function switch (13K359)
  • indicator bulbs in the virtual image instrument cluster (10849)
  • circuit wiring and circuit protection
Turn signal system operates as follows:
  • The multi-function switch is protected by fuse junction panel Fuse 3 (10A). This fuse is hot in RUN.
  • Circuits 104 (LB/O) and 105 (R/W) connect lighting control module to the left and right turn signal switches of the multi-function switch.
  • Ground is provided to the lighting control module and the turn signal miniature bulbs through Circuit 57 (BK).
  • Turn signal functions are performed by double filament bulbs in lamp assemblies located next to the headlamps.
  • The turn/hazard function utilizes the second filament of the appropriate bulb(s).
  • With the multi-function switch in the right turn position, power is supplied to the RH front and rear turn signal miniature bulbs and the RH turn indicator in the instrument cluster.
  • With the multi-function switch in the left turn position, power is supplied to the LH front and rear turn signal miniature bulbs and the LH turn indicator in the instrument cluster.
  • Do you know what diagnostic trouble codes are ?
Section 17-01: Lighting, Exterior 1997 Continental Workshop Manual DIAGNOSIS AND TESTING Procedure revision date: 07/29/1996 Turn Signal Lamps/Hazard Warning Flasher Lamps
Inspection and Verification
  1. Verify the customer's concern by operating the turn signal/hazard flasher lamps to duplicate the condition.
  1. Inspect to determine if one of the following mechanical or electrical concerns apply:

    VISUAL INSPECTION CHART Mechanical Electrical
    • Damaged multi-function switch.
    • Circuitry open/shorted.
    • Fuse junction panel fuses:
      • 1 (10A)
      • 3 (10A)
      • 7 (15A)
      • 13 (15A)
      • 19 (10A)
      • 20 (10A)
      • 25 (10A)
      • 31 (15A)
    • Power distribution box Fuse 16 (20A)
    • Bulb open.
  1. If inspection reveals an obvious concern that is readily serviced, correct the concern before continuing with Inspection and Verification.
  1. If a concern remains after the inspection, connect the Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent to the data link connector (DLC) located beneath the instrument panel to perform DATA LINK DIAGNOSTICS test. If the NGS responds with NO RESPONSE/NOT EQUIPPED for the lighting control module, GO to Pinpoint Test CA. If the DATA LINK DIAGNOSTICS test is passed for the lighting control module, retrieve continuous DTCs and execute Self Test Diagnostics for the lighting control module to retrieve current DTCs.
  1. If self test is passed and no DTCs are retrieved, go to the Symptom Chart to continue diagnostics.
  1. If DTCs are retrieved, go to the Lighting Control Module (LCM) Diagnostic Trouble Code (DTC) Index to continue diagnostics.
  1. If the lighting control module cannot be accessed by the NGS, go to Pinpoint Test CA.
Rotunda Service Bay Diagnostic System (SBDS®) 001-00001 may also be used to diagnose this system.
your best bet mite be to take it to a qualified repair shop. Unless you have a scan tool that can check for DTC'S an know how to use a wiring diagram an DMM - digital multi-meter to test electrical circuits .

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Did you check fuse's ? There is also a electronic module involved ! Totally integrated power module ! Watch this video , could be something simple , usually is ! You don't want to have to pay 7 or 8 hundred dollars for the power module ! Dodge Ram Turning Signal Electrical Problems

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My car is a Malibu chevrolet 2007 and I found out my back left light turn signal was not working. Little after that I realize that my automatic head lights also didnt work. I drove with my high beams...

It could be a few thing's an doing electrical circuit testing with a voltmeter is the only way to find the problem's . The turn signals are controlled by the BCM - body control module , do you know what that is ? A electronic module . Looking at a wiring I see the BCM supply's B+ power through the rear fuse box to the right turn signal bulb on the lite blue wire at the bulb connector , the black wire is ground an connected at G403 . Having a full vehicle module scan may show DTC'S - diagnostic trouble codes . If you don't know about automotive electrical an electronics your best bet ,take it to a qualified repair shop. Automatic headlamps - same thing controlled by the BCM ,warning buzzers too .

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