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Home › Dodge and Ram › 1999 › Caravan Base, 3.3 R › Repair and Diagnosis › Body & Frame › Body, Cab Control Systems › Body Control Computer - Tests › Exterior Lighting System › Automatic Headlights Signal Circuit Open

Automatic Headlights Signal Circuit Open

NOTE: For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER - INTRODUCTION article. Perform VERIFICATION TEST VER-1A  after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Using scan tool, select BODY CONTROL MODULE. If scan tool displays NO RESPONSE or CCD BUS FAILURE, go to appropriate VEHICLE COMMUNICATIONS article. If scan tool does not display NO RESPONSE or CCD BUS FAILURE, go to next step.
  2. Using scan tool, select POWERTRAIN CONTROL MODULE. If scan tool displays NO RESPONSE or CCD BUS FAILURE, go to appropriate VEHICLE COMMUNICATIONS article. If scan tool does not display NO RESPONSE or CCD BUS FAILURE, go to next step.
  3. Using scan tool, select BODY, BODY COMPUTER then SENSORS. Using scan tool, read AUTO HEADLAMP SENS VOLTS. If voltage is .6-4.8 volts, replace Body Control Module (BCM). BCM is located with junction block under driver's side instrument panel. See Figure . If voltage is not .6-4.8 volts, go to next step.
  4. Turn ignition off. Disconnect BCM connector "B" and ensure connector is clean and not damaged. Turn ignition on. Connect jumper wire between chassis ground and BCM connector "B" terminal No. 51 (White/Light Green wire). Disconnect interior electrochromic mirror connector and ensure connector is clean and not damaged. Using external ohmmeter, measure resistance between ground and interior electrochromic mirror connector terminal No. 7 (Black/Dark Green wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open Black/Dark Green wire between inside mirror connector and BCM.
  5. Remove jumper wire. Measure resistance between ground and interior electrochromic mirror connector terminal No. 7 (Black/Dark Green wire). If resistance is less than 1000 ohms, repair short to ground in Black/Dark Green wire between inside mirror connector and BCM. If resistance is 1000 ohms or more, replace interior electrochromic mirror.
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