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Diagnosis And Testing - Headlamp Switch

WARNING: This page is about a different car, the 2016 RAM 3500 HD and 2016 RAM 2500 HD. 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. Refer to WARNING . 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: Headlamp Switch Connector Terminal Identification
GC0091932Courtesy of CHRYSLER GROUP, 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.
    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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