Component Circuits Diagnosis

Use the following "Diagnosis," to determine if malfunction is caused by instrument panel cluster, wiring or another Component. If cluster is malfunctioning component, then the cluster needs to be replaced.

Residue from Silicon Based Cleaners
Refer to the "Cleaning Instrument Cluster Lens/Mask" procedures to remove the residue.

Headlamp Switch
Refer to "Lever Combination Switch (LCS)" for testing. Headlamp Switch

Repair/replace as needed.

If this component is good go to the next item indicated on the chart.

I/P Cluster
If the complaint is the functionality of a gage, use the "System Performance Test" for that gage to start the diagnosis.

Otherwise inspect the flex printed circuit board (green flexible piece on the back of the I/P cluster housing) for scratches, tears or damage (could cause opens or shorts). Continuity can also be checked using a multimeter across the suspect circuit of the flex PCB.

Oil Pressure Switch
Check the resistance through the switch to ground.

Switch is normally closed at: 9.6-40 kPa (1.4 to 5.8 psi) measured on dropping pressure.

Low Brake Fluid Switch
Check the resistance through the switch to ground.

Switch resistance: OPEN when brake fluid full. Less than 1 ohm when brake fluid low.

Park Brake Switch
Check the resistance through the switch to ground.

Switch resistance: Open with parking brake Off Less than 1 ohm when parking brake On.

Speedometer and Tachometer
Refer to "System Performance Tests," for procedures to diagnosis the speedometer or tachometer.

ABS Control Module
Refer to "Diagnostic Information" procedures in the "Brakes Service Manual"

Repair/replace as needed.

If this component is good go to the next item indicated on the chart.

Daytime Running Lights (DRL) Logic
The DRL logic is incorporated into the speedometer gage and is not separately replaceable. With the key in the RUN position the following readings should appear when taking measurements at the specified pins of the instrument panel cluster harness connectors (disconnected from the instrument panel cluster.)

If any of the above checks fail, repair the open/short in the malfunctioning circuit or component.

If all the above checks are correct, rule out all other possible causes in the cause/complaint table. If all others are ruled out, the problem is most likely the cluster (connections, flex circuit, etc.) or the DRL logic (which is located on the speedometer gage printed circuit board. Refer to "Internal Resistance Checks for Speedometer" Verify that the complaint has been fixed.

Repair/replace as needed.

Generator
Refer to "Generator" for diagnosis. Alternator

Repair/replace as needed.

If this component is good go to the next item indicated on the chart.