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Diagnosis And Testing - Headlamp Switch

WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:

To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment.

Fig 1: Identifying Headlamp Switch Terminals
GC0091932Courtesy of CHRYSLER LLC
  1. Remove the headlamp switch from the instrument panel. Refer to SWITCH, Headlamp , Removal .
  2. Disconnect the instrument panel wire harness connector from the back of the headlamp switch.
  3. Using an ohmmeter, test the resistance or continuity between the terminals of the switch as shown in the HEADLAMP SWITCH TESTS table below.
    HEADLAMP SWITCH TESTS 
    SWITCH POSITION (PINS)  *RESISTANCE RANGE (OHMS) 
    AUTO (1 and 3) 4028.0 - 4457.0
    OFF (1 and 3) 1938.0 - 2147.0
    PARK (1 and 3) 1073.5 - 1191.5
    HEADLAMP (1 and 3) 627.0 - 698.0
    FOG LAMP - AUTO (1 and 3) 266.8 - 299.9
    FOG LAMP - OFF (1 and 3) 249.0 - 280.2
    FOG LAMP - PARK (1 and 3) 225.6 - 254.4
    FOG LAMP - HEADLAMP (1 and 3) 196.3 - 221.9
    DOME DEFEAT (2 and 3) 14121.2 - 15612.7
    PANEL DIMMER 1 (2 and 3) 5476.26 - 6057.7
    PANEL DIMMER 2 (2 and 3) 2911.2 - 3222.7
    PANEL DIMMER 3 (2 and 3) 1771.2 - 1962.7
    PANEL DIMMER 4 (2 and 3) 1125.2 - 1248.7
    PANEL DIMMER 5 (2 and 3) 726.2 - 807.7
    PANEL DIMMER 6 (2 and 3) 469.7 - 524.2
    PARADE MODE 296.4 - 332.6
    DOME ON (2 and 3) 166.2 - 188.7
    CARGO (3 and 6) MOMENTARY CONTINUITY
    SWITCH ILLUMINATION (4 and 5) LEDs - SET MULTIMETER TO DIODE MODE - CONNECT PIN 4 TO PLUS (+), CONNECT PIN 5 TO MINUS (-) - LEDs SHOULD BARELY GLOW
    *All resistance values are plus or minus 5%.
  4. If the switch fails any of the tests, replace the ineffective headlamp switch as required.
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