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Doesn't use a DRL module . Has DRL relay .
Symptom Chart
Condition
Possible Sources
Action
The daytime running lamps are inoperative.
Fuse
Circuit(s)
Daytime running lamps (DRL) relay
Light switch
Go To Pinpoint Test A .
Free wiring diagrams here http://www.bbbind.com/free-tsb/ Enter vehicle info. Year , make , model an engine . Under system click on lighting , then under subsystem click on daytime running lamps . Click the search button then the blue links . Looking at the wiring diagram i see the DRL relay is located in the BJB - this is the fuse / relay box in the engine compartment . To see location under system click on electrical distribution ,then on junction block . picture of fuse box shows location .
Lighting control module ? ?????? Hazard / flasher module ! Now ( there''s not even an electrical signal where the fuse plugs into the interior fuse panel.) What FUSE ??????
Stop Lamps
The STOP LP 25 A fuse in the underhood fuse block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to both the STOP 15 A fuse and the CHMSL 10 A fuse in the I/P fuse block, and to the turn signal/hazard module. The turn signal/hazard module then supplies voltage to both of the trailer rear turn/stop lamp supply voltage circuits. The voltage from the CHMSL 10 A fuse is to the center high mounted stop lamp (CHMSL) and the trailer jumper harness. The voltage from the STOP 15 A fuse is to the stop lamps, throttle actuator control (TAC) module, and the cruise control.
Backup Lamps
The backup lamp request signal is sent from the powertrain control module (PCM) to the body control module (BCM) on the Class 2 message system. This signal is based on the park neutral position (PNP) switch signal. The BCM supplies voltage on the backup lamp supply voltage circuit to the backup lamps and to the automatic day/night mirror. Voltage for the courtesy lamp supply voltage circuit and backup lamp supply voltage circuit is from the TBC B fuse in the instrument panel fuse block directly through the BCM to these circuits. A short to ground on either of these circuits will open the fuse. The backup lamps are grounded at G401.
For trailer wiring, a separate backup lamp circuit is connected through the underhood fuse block from the TRLR B/U 10 A fuse to the trailer wiring harness.
Turn Signal/Hazard Lamps
The IGN E 10 A fuse in the underhood fuse block supplies battery positive voltage to the turn signal/hazard switch assembly. The FLASH 25 A fuse in the I/P fuse block supplies battery positive voltage to the turn signal/flasher module and ground is supplied at G200. When the turn signal switch is placed in either the left or right position, a voltage signal is completed from the turn signal switch to the turn sign/flasher module. When the hazard flasher switch is activated, a ground signal is completed from the turn signal/hazard switch to the turn sign/flasher module. The turn sign/flasher module then sends an on-off voltage signal through the LT TRLR, RT TRLR, LT TURN or RT TURN 10 A fuses in the I/P fuse block to the appropriate turn signal or to all 4 fuses for hazard operation. The instrument panel cluster (IPC) indicators receive voltage from the LT TURN and RT TURN fuses as well as the DDM/PDM for the mirror turn signals. The DDM/PDM has no function or control of the mirror turn signals other that a pass through connection for the circuits. The audio chime is also activated when the turn signals are on. When the hazard switch is pressed, all turn signal lamps will flash including both IPC turn indicators. The front turn signals are grounded at G100. The rear turn signals are grounded at G401. The Mirror turn signals are grounded by the DDM/PDM.
Do you know how to do automotive electrical circuit testing with a test light or volt meter ? How to read an use a wiring diagram to pin point testing points . ( connectors , fuse locations etc... ) How to use a power flow chart ? Here is a site for just such info .
Could you give me a little more information? What does the fuse run? Maybe look at the big red wire feeding the fuse block. If it is a little fuse maybe a bigger fuse is blown which feeds power to smaller fuse? If I knew what function you were looking at I could maybe find a wiring diagram to tell you where the power source comes from.
According with the 2003 Yukon Denali Owners Manual, check on the Instrument Fuse Block, access door is on the drivers side edge of the instrument panel. Pull off the cover toa ccess the fuse block. Look "HVAC 1" tag label.
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{: ) There are two fuses that protect the front IP power outlet or lighter plugs. At the underhood fuse block, labeled CIG LTR 15amps and AUX PWR 20amps. See red arrows on diagram below.
The fuse on the driver side door fuse block labeled AUX PWR2 20amps protects the rear lighter plugs.
It is located on a fuse block attached to the main block behind the driver
side access door. The relay is accessable from under the dash, its way
up on the back of the fuse block and it should be green in color.
There may be bundles
of wires blocking its access, having small hands would help also. I hope
this info helps out
The cord is located on the driver's side of the engine compartment, near the power steering fluid reservoir; See page 2-24 of your Owner's Manual. On my truck, the dealer used a wire tie to clip the plug to the front grillwork. It may be hard to find if the black plastic plug it is tucked away behind the black grill plastic.
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