Lighting Systems: Overview Pontiac Aztek I

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

Scheme 64

1. 2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
2. 5. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.

Scheme 65

Scheme 66

The number(s) below refer to the step number(s) on the diagnostic table.

Scheme 67

1. 2. This step verifies that the body control module is providing reference voltage to the headlamp switch.
2. 3. This step tests the dimming return circuit for a high resistance or an open.

The number(s) below refer to the step number(s) on the diagnostic table.

Scheme 68

1. 2. This step tests the dimming reference circuit for a short to battery positive voltage.
2. 3. This step tests the dimming return circuit for a short to battery positive voltage.

The number below refers to the step number on the diagnostic table.

Scheme 69

1. 2. This step tests the ambient light sensor reference voltage circuit for a short to battery positive voltage.

The number(s) below refer to the step number(s) on the diagnostic table.

Scheme 70

Scheme 71

1. 3. This step tests for the proper operation of the circuit in the high voltage range.
2. 4. This step tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.

The numbers below refer to the step numbers on the diagnostic table.

Scheme 72

Scheme 73

1. 2. Test for a short to battery positive voltage in the high beam headlamp signal circuit.
2. 3. Test for a short to ground or an open in the high beam headlamp signal circuit.

Important: Complete the following steps before using the symptom table.

1. Perform «DIAGNOSTIC SYSTEM CHECK - LIGHTING SYSTEMS»(ref-181061-S10285412092005073100000) before using the Symptom Tables in order to verify that all of the following are true: No DTCs are set. The control module can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to «EXTERIOR LIGHTING SYSTEMS DESCRIPTION AND OPERATION»(ref-181061-S10496259852005073100000) and «INTERIOR LIGHTING SYSTEMS DESCRIPTION AND OPERATION»(ref-181061-S03601459782005101100000) .