Test 48B - Auto Headlight Sun Sensor Input Circuit
NOTE:
For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER
section in this article. Perform TEST VER-1
VERIFICATION TEST after each repair.
CAUTION:
Always turn ignition off prior to disconnecting any module connector.
- Cover sun sensor. Sun sensor is located at center of upper dash. Using scan tool, read auto headlight sensor voltage. If scan tool displays more than 4.8 volts, go to step 4). If scan tool displays 4.8 volts or less, go to next step.
- Disconnect sun sensor connector. For dash removal and installation procedure, see appropriate INSTRUMENT PANEL article. Using scan tool, read auto headlight sensor voltage. If scan tool displays AUTO HEADLIGHT SENSOR: 5.0V, replace sun sensor. If scan tool does not display AUTO HEADLIGHT SENSOR: 5.0V, go to next step.
- Turn ignition off. Disconnect Body Control Module (BCM) Gray connector. BCM is located behind right kick panel. Using scan tool in ohmmeter mode, check resistance of BCM Gray connector terminal No. 20 (Dark Blue/Red wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Red wire. If resistance is 5 ohms or greater, replace BCM.
- Using scan tool in monitors mode, read ENGINE INFO. If scan tool displays NR (No response), go to TEST 114A . If scan tool does not display NR, observe scan tool while starting engine. If engine speed increases to more than 450 RPM when starting engine, replace BCM. If engine speed does not increase, replace Powertrain Control Module (PCM).