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For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 Riviera 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Instrument Cluster Illumination Lamps Do Not Dim

Instrument Cluster Illumination Lamps Do Not Dim Buick

Step

Action

Value(s)

Yes

No

1

Did you perform the Instrument Cluster System Check?

--

Go to Step 2

Go to Instrument Cluster System Check

2
  1. Turn the ignition switch to OFF.
  2. Disconnect the instrument cluster connector C1.
  3. Turn the headlamp switch to PARK or HEAD.
  4. Turn the dimmer control to LO.
  5. Using a J 39200 digital multimeter (DMM), measure the voltage from the instrument cluster connector C1 terminal F5 to ground.

Does the voltage equal the specified value?

12 V

Go to Step 4

Go to Step 3

3

Inspect CKT 390 (YEL) for an open or short to ground.

Is the wiring OK?

--

Go to Instrument Cluster System Check

--

4
  1. Adjust the dimmer control.
  2. At the same time, measure the voltage from the instrument cluster connector C1 terminal F4 (GRY) to ground.

Does the voltage vary with the dimmer control?

--

Go to Step 6

Go to Step 5

5
  1. Connect the dimmer module connector.
  2. Adjust the dimmer control.
  3. At the same time, backprobe the dimmer module connector.
  4. Measure the voltage from terminal C to ground.

Does the voltage vary with the dimmer control?

--

Go to Step 8

Go to Interior Lights Dimming System Check

6

Inspect the instrument cluster connector C1 terminal F4 and terminal F5 for proper terminal contact.

Is the contact OK?

--

Go to Step 7

--

7

Replace the instrument cluster.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

8

Inspect CKT 8 (GRY) for an open or short to ground.

Is the circuit OK?

--

Go to Instrument Cluster System Check

Go to Step 9

9

Repair the wiring.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

Instrument Cluster Illumination Lamps Do Not Dim Oldsmobile

Step

Action

Value(s)

Yes

No

1

Did you perform the Instrument Cluster System Check?

--

Go to Step 2

Go to Instrument Cluster System Check

2
  1. Turn the ignition switch to OFF.
  2. Disconnect the instrument cluster connector C2.
  3. Turn the headlamp switch to PARK or HEAD.
  4. Turn the dimmer control to LO.
  5. Using a J 39200 digital multimeter (DMM), measure the voltage from the instrument cluster connector C1 terminal D11 to ground.

Does the voltage equal the specified value?

12 V

Go to Step 4

Go to Step 3

3

Inspect CKT 390 (YEL) for an open or short to ground.

Is the wiring OK?

--

Go to Instrument Cluster System Check

--

4
  1. Adjust the dimmer control.
  2. At the same time, measure the voltage from the instrument cluster connector C1 terminal C7 (BRN) to ground.

Does the voltage vary with the dimmer control?

--

Go to Step 6

Go to Step 5

5
  1. Connect the dimmer module connector.
  2. Adjust the dimmer control.
  3. At the same time, backprobe the dimmer module connector.
  4. Measure the voltage from terminal C to ground.

Does the voltage vary with the dimmer control?

--

Go to Step 8

Go to Interior Lights Dimming System Check

6

Inspect the instrument cluster connector C1 terminal C7 and terminal D11 for proper terminal contact.

Is the contact OK?

--

Go to Step 7

--

7

Replace the instrument cluster.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

8

Inspect CKT 1244 (BRN) for an open or short to ground.

Is the circuit OK?

--

Go to Instrument Cluster System Check

Go to Step 9

9

Repair the wiring.

Is the repair complete?

--

Go to Instrument Cluster System Check

--