Question about 2007 Pontiac Grand Prix GXP Sedan

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Headlights on 2007 Grand Prix not coming on. No high or low beams. Turn signals work.

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  • Pontiac Master
  • 19,396 Answers

Hi.


Start checking fuses and bulbs.


On Grand prix you have two fuse panels, one inside the cabin and one under the hood. You will need to check both.
Under the hood you should have a 60 Amps light circuit breaker.
The individual fuses can be tested removing fuse from fusholder and using a multimeter to read Ohms on fuse contacts. Fuse must have low impedance, if Ohms are infinite , then fuse must be replaced.


If fuses are Ok, check the bulbs. read if there is voltage at bulb contact using a voltmeter, if volts are OK, then bulbs had blown all at once because of a contact.


If there is still no power at contacts and fuses are good, then remaining parts to test are light switches and BCM.

Light switches are tested taking apart the light control, and pointing an Ohmmeter to the switch contact to check if the circuit is opening and closing when you use the switch.

If switch is OK, all lights and other functions are controlled by a small square box called BCM (Body control Module), located below the driver side dash to the left of the steering column.
BCM looks like a small box with many wires attached and controls all chassis functions.


Parts available here:
PartsTrain.com



Here wiring info to BCM, from service manual:


12volts red (50A), red (40A) + back of fuse box, passenger dash
Starter yellow + ign harn or BCM, conn. C1, pin 21
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Second Starter N/A
Ignition pink + ign harn or BCM, conn. C1, pin 22
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.

There are two pink wires in the BCM plug that meter as ignition. To verify that the correct wire is being energized for remote start, slide the key in the ignition key cylinder and then activate remote start. If the key in ignition warning chime comes on, then the correct wire is being energized.
Second Ignition N/A
Third Ignition N/A
Accessory brown + ign harn or BCM, conn. C1, pin 23
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Second Accessory N/A
Keysense lt. green - ign harn or BCM, conn. C1, pin 40
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.

If the service security lights comes on during remote start or after key takeover, see DirectFax document 1502.
Power Lock red/black - BCM, conn. C2, pin 2
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Power Unlock orange/black - BCM, conn. C2, pin 11
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Lock Motor gray 5wi BCM, conn. C2, pin 52
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Unlock Motor tan 5wi BCM, conn. C2, pin 46
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Parking Lights+ brown + front of fuse box, passenger dash
Parking Lights- brown/white - BCM, 18 pin plug, pin 8
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Hazards tan - BCM, 18 pin plug, pin 16
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Turn Signal(L) use hazards wire
Turn Signal(R) use hazards wire
Reverse Light lt. green + BCM, conn. C2, pin 42
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Door Trigger see notes - BCM, conn. C2
Notes: The driver door trigger is gray/black in pin 26, the front passenger door is black/white in pin 17, the left rear door is lt. blue/black in pin 7, and the right rear door is lt. green/black in pin 5. Use all four wires and diode isolate each.

The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Dome Supervision gray/black + BCM, conn. C1, pin 43
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Trunk/Hatch Pin red/black - BCM, conn. C2, pin 3
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Hood Pin N/A
Trunk/Hatch Release lt. blue + BCM, conn. C2, pin 45
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Power Sliding Door N/A
Factory Alarm Arm lt. green - BCM, conn. C2, pin 22
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Factory Alarm Disarm purple - BCM, conn. C2, pin 24
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Disarm No Unlock see factory alarm disarm
Tachometer white ac ignition control module, pin E
Notes: The ignition control module is on top of the engine towards the passenger side.
Wait to start N/A
Brake Wire white + BCM, conn. C2, pin 30
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Parking Brake orange/black - BCM, conn. C2, pin 9
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.
Horn Trigger black - BCM, conn. C1, pin 4
Notes: The BCM (Body Control Module) is below the driver side dash to the left of the steering column.


Posted on Nov 19, 2009

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