DRL's Cycling

new 07/23/2004

DRL's Cycling

I was on my way to Ozzfest today and a man told me that my driving lights (headlights during the day) where blinking off and on . What would be the probable cause . I haven't dug in yet as the time was not there today , so I just turned on the parking lights and they quit blinking off and on . Where should I start ?

On the plus side the car runs excellent , and all feels fine and very stable underneath . The best part is I only have about $1300.00 and about 10 hours labor in it . I really like these cars alot and see what all of you do in them . I just need to work out the bugs before the body goes to be done .

Also , my sub is working , but not the other two speakers . I mildly pushed the cones and they move freely leading me to believe they are not blown . Where should I start ?

B.King13

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Did you have auto lamp engaged? You may have been driving when the light was at the sensor threshold and the computer is turning the headlights on and off.

Joe Wede

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It wouldn't blink. There is a delay built in to the auto-lamp circuit.

Paul L Fisher

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Cycling of the headlights when on is usually caused by the circuit breaker resetting it self. You must have a short somewhere. If it is both lights then look for the common source.

Paul Nimz

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It's only doing it when the headlights are in the off position and the auto lights are off . When I use the headlights I have no problem . It`s just the dim daylights that come on automatically when you start the car .

B King(13)

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Here is the test sequence according to http://www.alldatadiy.com/

Inspection and Verification (Start Testing Here)

Verify the customer's concern by operating the headlamp/autolamp system to duplicate the condition.
Inspect to determine if one of the electrical concerns apply: VISUAL INSPECTION CHART Electrical
Circuitry open/shorted.
Damaged Connectors.
Damaged light sensor amplifier.
Damaged headlamp time delay a switch
Damaged relay.
Power distribution box Fuse:
20 (15 A) .
22 (30 A) .
Fuse junction panel Fuse:
3 (10 A) .
4 (10 A) .
30 (30 A) .
Damaged headlamp switch.
If the inspection reveals obvious concern(s) that can be readily identified, service as required.
If the concern(s) remains after the inspection, determine the symptom(s) and go to the Symptom Chart. See: Symptom Chart(s)

Here’s the DRL tests:

Description and Operation

The Daytime Running Lamps (DRL) system operates the low beam head lamps at a reduced intensity. The DRL module supplies pulse width modulated voltage, approximately 75%-92% of battery voltage, to the low beam headlamps when the following conditions are met:

parking brake control is released
high beam headlamps are disabled
ignition switch is in RUN position
The DRL module remains enabled when the low beam headlamps are turned on.

Inspection and Verification (Start Testing Here)

Verify the customer's concern by following these steps:
Turn ignition switch OFF.
Turn headlamp switch to HEAD.
Check low beam headlamp operation.
Refer to Headlamps to service headlamp concerns before checking daytime running lamps control.
Check daytime running lamps system operation:
Turn ignition switch to RUN.
Verify parking brake control is fully released.
Check for low beam head lamps ON at reduced intensity.
Inspect to determine if one of the electrical concerns apply: VISUAL INSPECTION CHART Electrical
Open battery junction box fuse: Fuse 15 (15 A)
Open central junction box fuse: Fuse 6 (15 A)
Circuitry open/shorted.
Damaged ignition switch.
Damaged daytime running lamps control module.
If the inspection reveals obvious concern(s) that can be readily identified, service as required.
If the concern(s) remains after the inspection, determine the symptom(s) and go to the Symptom Chart. See: Symptom Chart(s)

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I'd just pull the fuse unless you feel you need the DRLs. Here's a picture of the module.

Paul Nimz

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