Component Testing

BULBS

Visually inspect the bulb. Check the resistance through the bulb.

Repair as needed.

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


TAILLAMP ASSEMBLIES

Visually inspect the lamp assembly. Check resistance through the connector and pigtail.

Repair as needed.

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


HEADLAMP SWITCH

Check switch resistance.

Switch resistance:

Pin F to Pin K in: Off Open
Doors Open Open
Park Less than 1 ohm
Headlamp Less than 1 ohm

Repair as needed.


I/P DIMMER

Check switch resistance.

Switch resistance: Dim Greater than 8 ohms
Medium 3 - 7 ohms
Bright Less than 2 ohms

Repair as needed.


STOP LAMP SWITCH (BRAKE SWITCH)

Check connections and terminals for damage, tightness, or corrosion.

Check switch resistance:

Pin A or B (Gray connector) to Pin C or D (Black connector).

Switch resistance: OPEN when brake not depressed. Less than one ohm when brake depressed.

FLASHER MODULE

Refer to chart for diagnosis.

Flasher Module Diagnosis: