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Dan
Dan, Pontiac Technician
Category: Pontiac
Satisfied Customers: 3490
Experience:  GM Certified, GM Mark of Excellence, ASE Master Certified.
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2007 Grand Prix Gt: my heand lights went out..blower

Customer Question

I have a 2007 Grand Prix Gt and my heand lights went out. I have seen on other postings to ceck the blower reistor. This seems to be fine. the only this i have lost are my low beams. Is there a relay or somthing else that i should be looking at ?
Submitted: 8 years ago.
Category: Pontiac
Expert:  Dan replied 8 years ago.
Headlamps Inoperative - Low Beams

Step

Action

Yes

No

Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics

Connector End View Reference: Master Electrical Component List

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Turn ON the headlamps.
  2. Ensure that the headlamp dimmer switch is in the LOW position.

Do both low beam headlamps illuminate?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Is only one low beam headlamp inoperative?

Go to Step 12

Go to Step 4

4

  1. Disconnect the body control module (BCM) connector C1.
  2. Connect a jumper between the headlamp low beam relay control circuit and ground.

Do the low beam headlamps illuminate?

Go to Step 5

Go to Step 7

5

  1. Reconnect the BCM connector C1.
  2. Disconnect the multifunction switch.
  3. Install a jumper between the headlamp switch headlamps ON signal circuit and ground.

Do the low beam headlamps illuminate?

Go to Step 9

Go to Step 6

6

Test for a poor connection , open or short to battery voltage, in the headlamp switch headlamps ON signal circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 18

Go to Step 13

7

  1. Remove the low beam headlamp relay.
  2. Install a fused jumper between the battery positive voltage supply circuit and the switched low beam voltage supply circuit.

Do the low beam headlamps illuminate?

Go to Step 8

Go to Step 11

8

Test for a poor connection, open or a short to battery positive voltage in the low beam relay control circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 19

Go to Step 10

9

Inspect for a poor connection at the harness connector of the headlamp dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 19

Go to Step 14

10

Inspect for a poor connection at the low beam relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 19

Go to Step 15

11

Inspect for a poor connection at the harness connector of the underhood fuse block. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 19

Go to Step 17

12

Inspect the inoperative low beam headlamp voltage supply and ground circuit for a high resistance, short to ground, or an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 19

Go to Step 16

13

Test for a short to ground or a short to battery positive voltage in the exterior lamps OFF input circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 19

Go to Step 18

14

Replace the multifunction turn signal switch. Refer to Turn Signal Multifunction Switch Replacement .

Did you complete the replacement?

Go to Step 19

--

15

Replace the low beam relay. Refer to Relay Replacement .

Did you complete the replacement?

Go to Step 19

--

16

Replace the inoperative low beam headlamp. Refer to Headlamp Assembly or Headlamp Bulb Replacement .

Did you complete the replacement?

Go to Step 19

--

17

Replace the underhood fuse block. Refer to Testing for Intermittent Conditions and Poor Connections .

Did you complete the replacement?

Go to Step 19

--

18

Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 19

--

19

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3