2002 Buick Park Avenue Twilight Sensor

Tiny
RICHMAN
  • MEMBER
  • 2002 BUICK PARK AVENUE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 64,000 MILES
The "Twilight Sensor" on my 2002 Park Avenue can't decide if it is day or night. It will switch from day mode to night mode in the middle of a sunny day and later back to day mode again. When this happens, the dash lights and HUD dim so they are hard to see. I have had it to the dealer and they have not been able to find the problem yet. This is an intermitent problem which makes it hard to recreate in the shop. The problem seems to be worse on bright days but I can't be totally sure. Haven't had the car that long. It also seems like the radio looses sensitivity when this happens.

Also, the gas guage can't decide if it is full, empty or in between. This change happens when turning corners with a 1/2 full tank.

Can these problems be related to each other or just coincedental.

Battery voltage is at 14.3V when any or all of these things happen.

Any ideas where to start to direct the dealer to the problem?
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Thursday, January 17th, 2008 AT 11:05 AM

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Tiny
DENNYP
  • EXPERT
Twilight Sentinel Inoperative
Step
Action
Value(s)
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No

Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1
Did you perform the Lighting System Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check - Lighting Systems

2

Important:
Vehicle shift lever must be out of the PARK position and the parking brake disengaged in order for the daytime running lamps (DRL) to operate.

Verify the headlamp switch is in the OFF position.
Turn ON the ignition, with the engine OFF.
Place the twilight switch to the MAX position.
Depress and hold the brake pedal.
Move the gear selector out of park position.
Verify the parking brake is disengaged.
Expose the ambient light sensor to a bright light.
Wait about 20 seconds.
Observe the DRL lamps.
Cover the ambient light sensor.
Wait about 20 seconds.
Observe the DRL lamps.
Place the gear selector in the park position.
Release the brake pedal.
Do the headlamps switch between low beam and daytime running lamps (DRL)?
--
Go to Testing for Intermittent and Poor Connections in Wiring Systems
Go to Step 3

3
Do the headlamps operate properly?
--
Go to Step 4
Go to Headlamps Inoperative - Low Beams or Headlamps Inoperative - High Beams

4
Turn OFF the ignition.
Disconnect the Lamp Control Module (LCM).
Connect a test lamp between the ignition 1 voltage circuit at the LCM connector and ground.
Turn ON the ignition, with the engine OFF.
Does the test lamp illuminate?
--
Go to Step 5
Go to Step 14

5
Turn OFF the ignition.
Connect a DMM between the twilight sentinel delay signal circuit at the LCM connector and a good ground.
Vary the twilight delay control from MIN to MAX.
Does the resistance vary within the specified range?
3.5K-200K ohms
Go to Step 6
Go to Step 8

6
Cover the ambient light sensor.
Connect a DMM between ambient light sensor signal circuit at the LCM connector and a good ground.
Is the resistance greater than the specified value?
31K ohms
Go to Step 7
Go to Step 9

7
Expose the ambient light sensor to a bright light.

Is the resistance less than the specified value?
23K ohms
Go to Step 13
Go to Step 9

8
Test the twilight sentinel delay signal circuit for high resistance, an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 18
Go to Step 11

9
Test the ambient light sensor ground circuit for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 18
Go to Step 10

10
Test the ambient light sensor signal circuit for a high resistance, an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 18
Go to Step 12

11
Inspect for poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 18
Go to Step 15

12
Inspect for poor connections at the harness connector of the ambient light sensor. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 18
Go to Step 16

13
Inspect for poor connections at the harness connector of the LCM. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 18
Go to Step 17

14
Repair the open or short to ground in the ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?
--
Go to Step 18
--

15
Replace the headlamp switch. Refer to Headlamp Switch Replacement.

Did you complete the replacement?
--
Go to Step 18
--

16
Replace the ambient light sensor. Refer to Ambient Light Sensor Replacement.

Did you complete the replacement?
--
Go to Step 18
--

17
Replace the LCM. Refer to Lamp Control Module Replacement.

Did you complete the replacement?
--
Go to Step 18
--

18
Operate the system in order to verify the repair.

Did you correct the condition?
--
System OK
Go to Step 2
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Thursday, January 17th, 2008 AT 8:00 PM

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