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For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Corvette 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Component Illumination Lamps Inoperative

Component Illumination Lamps Inoperative Door Switch

LH or RH Door Switch Illumination Inoperative, or Always On

Step

Action

Value(s)

Yes

No

DEFINITION: The parking lamps and instrument cluster illumination lamps function properly.

1

Has the Interior Lights Dimming System Check been performed?

--

Go to Step 2

Go to Interior Lights Dimming System Check

2
  1. Remove the door switch and disconnect the switch connector.
  2. Connect a test light between,
    3. • LH door switch connector terminals 21 and 22.
    • RH door switch connector terminals 1 and 2.
  3. Cover the ambient light sensor on the RH DIC.
  4. Doors and hatch/trunk lid closed, allow approximately 30 seconds for the courtesy lamps to turn off.
  5. Turn the parking lamp switch on.
  6. Turn the interior lamp dimmer switch to the full bright position.

Does the test light illuminate bright?

--

Go to Step 5

Go to Step 3

3

Connect the test light from the,

    • LH door switch connector terminal 22 to ground.
    • RH door switch connector terminal 2 to ground.

Does the test light illuminate bright?

--

Go to Step 4

Go to Step 7

4
  1. Disconnect the DCM connector C4.
  2. Connect a DMM from the DCM connector C4 terminal 21 to the,
    3. • LH door switch connector terminal 21.
    • RH door switch connector terminal 1.
  3. Measure the resistance of circuit 157.

Is the resistance within specified values?

0-2 ohms

Go to Step 12

Go to Step 9

5

Turn the interior lamp dimmer switch to the off position.

Does the test light change from bright to dim and turn off?

--

Go to Step 10

Go to Step 6

6

Disconnect the DCM connector C4.

Is the test light illuminated?

--

Go to Step 11

Go to Step 12

7
  1. Disconnect the DCM connector C4.
  2. Connect a DMM from the DCM connector C4 terminal 22 to the,
    3. • LH door switch connector terminal 22.
    • RH door switch connector terminal 2.
  3. Measure the resistance of circuit 580.

Is the resistance within specified values?

0-2 ohms

Go to Step 12

Go to Step 8

8

Repair the open or high resistance condition in circuit 580.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

9

Repair the open or high resistance condition in circuit 157.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

10

Replace the door switch. Refer to Front Side Door Window Switch Replacement .

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

11

Repair the short to ground in circuit 157.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

12

Replace the DCM. Refer to Door Control Module Replacement .

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

Component Illumination Lamps Inoperative HVAC Control Head

HVAC Illumination Inoperative, or Always On

Step

Action

Value(s)

Yes

No

DEFINITION: The parking lamps and instrument cluster illumination lamps function properly.

1

Has the Interior Lights Dimming System Check been performed?

--

Go to Step 2

Go to Interior Lights Dimming System Check

2
  1. Remove the HVAC control head and disconnect connector C1. Refer to Control Assembly Replacement in HVAC Manual, or Control Assembly Replacement in HVAC Automatic.
  2. Connect a test light between connector C1,
    3. • terminals J and K. (C60)
    • terminals C1 and C16. (CJ2)
  3. Cover the ambient light sensor on the RH DIC.
  4. Doors and hatch/trunk lid closed, allow approximately 30 seconds for the courtesy lamps to turn off.
  5. Turn the parking lamp switch on.
  6. Turn the interior lamp dimmer switch to the full bright position.

Does the test light illuminate bright?

--

Go to Step 5

Go to Step 3

3

Connect the test light from the HVAC control head connector C1,

    • terminal J to ground. (C60)
    • terminal C16 to ground. (CJ2)

Does the test light illuminate bright?

--

Go to Step 7

Go to Step 4

4
  1. Disconnect the BCM connector C3.
  2. Connect a DMM from the BCM connector C3 terminal B2 to the HVAC connector C1,
    3. • terminal J. (C60)
    • terminal C16. (CJ2)
  3. Measure the resistance of circuit 390.

Is the resistance within specified values?

0-2 ohms

Go to Step 11

Go to Step 8

5

Turn the interior lamp dimmer switch to the off position.

Does the test light change from bright to dim and turn off?

--

Go to Step 9

Go to Step 6

6

Disconnect the BCM connector C3.

Is the test light illuminated?

--

Go to Step 10

Go to Step 11

7

Repair the open or high resistance condition in circuit 150.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

8

Repair the open or high resistance condition in circuit 390.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

9

Replace the HVAC control head. Refer to Control Assembly Replacement in HVAC Manual, or Control Assembly Replacement in HVAC Automatic.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

10

Repair the short to voltage in circuit 390.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

11

Replace the BCM. Refer to Body Control Module Replacement Body Control Module (BCM) Programming/RPO Configuration .

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

Component Illumination Lamps Inoperative PRNDL

PRNDL Illumination Inoperative, or Always On

Step

Action

Value(s)

Yes

No

DEFINITION: The parking lamps and instrument cluster illumination lamps function properly.

1

Has the Interior Lights Dimming System Check been performed?

--

Go to Step 2

Go to Interior Lights Dimming System Check

2
  1. Disconnect the BTSI control solenoid 4 pin connector.
  2. Connect a test light between terminals A and B.
  3. Cover the ambient light sensor on the RH DIC.
  4. Doors and hatch/trunk lid closed, allow approximately 30 seconds for the courtesy lamps to turn off.
  5. Turn the parking lamp switch on.
  6. Turn the interior lamp dimmer switch to the full bright position.

Does the test light illuminate bright?

--

Go to Step 5

Go to Step 3

3

Connect the test light from the BTSI control solenoid 4 pin connector terminal A to ground.

Does the test light illuminate bright?

--

Go to Step 4

Go to Step 7

4
  1. Disconnect the BCM connector C3.
  2. Connect a DMM from the BTSI control solenoid 4 pin connector terminal B, to the BCM connector C3 terminal B6.
  3. Measure the resistance of circuit 8.

Is the resistance within specified values?

0-2 ohms

Go to Step 11

Go to Step 8

5

Turn the interior lamp dimmer switch to the off position.

Does the test light change from bright to dim and turn off?

--

Go to Step 9

Go to Step 6

6

Disconnect the BCM connector C3.

Is the test light illuminated?

--

Go to Step 10

Go to Step 11

7

Repair the open or high resistance condition in circuit 240.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

8

Repair the open or high resistance condition in circuit 8.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

9

Replace the PRNDL illumination bulb. Refer to Transmission Floor Shift Control Indicator Lamp Replacement .

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

10

Repair the short to ground in circuit 8.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

11

Replace the BCM. Refer to Body Control Module Replacement Body Control Module (BCM) Programming/RPO Configuration .

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

Component Illumination Lamps Inoperative TCS Switch

TCS Switch Illumination Inoperative, or Always On

Step

Action

Value(s)

Yes

No

DEFINITION: The parking lamps and instrument cluster illumination lamps function properly.

1

Has the Interior Lights Dimming System Check been performed?

--

Go to Step 2

Go to Interior Lights Dimming System Check

2

Does the fuel tank filler door lock release function properly?

Go to Step 3

Go to Power Distribution

3
  1. Disconnect the TCS switch connector.
  2. Connect a test light between terminals 9 and 10.
  3. Cover the ambient light sensor on the RH DIC.
  4. Doors and hatch/trunk lid closed, allow approximately 30 seconds for the courtesy lamps to turn off.
  5. Turn the parking lamp switch on.
  6. Turn the interior lamp dimmer switch to the full bright position.

Does the test light illuminate bright?

--

Go to Step 6

Go to Step 4

4

Connect the test light from the TCS switch connector terminal 10 to ground.

Does the test light illuminate bright?

--

Go to Step 5

Go to Step 8

5
  1. Disconnect the BCM connector C3.
  2. Connect a DMM from the TCS switch connector terminal 9, to the BCM connector C3 terminal B1.
  3. Measure the resistance of circuit 1244.

Is the resistance within specified values?

0-2 ohms

Go to Step 12

Go to Step 9

6

Turn the interior lamp dimmer switch to the off position.

Does the test light change from bright to dim and turn off?

--

Go to Step 10

Go to Step 7

7

Disconnect the BCM connector C3.

Is the test light illuminated?

--

Go to Step 11

Go to Step 12

8

Repair the open or high resistance condition in circuit 2840.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

9

Repair the open or high resistance condition in circuit 1244.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

10

Replace the TCS switch.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

11

Repair the short to ground in circuit 1244.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

12

Replace the BCM. Refer to Body Control Module Replacement Body Control Module (BCM) Programming/RPO Configuration .

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--