DTC B2472: Low Beam Output Fault: Testing
- Connect scan tool. Turn ignition switch to ON position. Turn headlight switch off. Using scan tool, select BCM TEST. Select LIGHTS, then select LOW BEAM. Using scan tool, turn low beams on, then off. If headlights do not come on, go to next step. If headlights come on, go to step 3 .
- Turn headlight switch on. If headlights come on, go to step 4 . If headlights do not come on, go to step 5 .
- Disconnect White 16-pin connector C201 (body-to-instrument panel wiring harness, located behind left side of instrument panel, below headlight switch). Using scan tool, turn low beams off. If headlights are off, go to step 6 . If headlights are on, go to step 7 .
- Cycle ignition. If DTC B2472 is current, go to step 10 . If DTC B2472 is now history, go to step 11 .
- Check for open in Yellow wire between headlight relay and White 16-pin connector C201 (body-to-instrument panel wiring harness, located behind left side of instrument panel, below headlight switch). If faulty circuit is found, go to step 16 . If circuit is okay, go to step 15 .
- Disconnect headlight switch connectors. Using DVOM, measure resistance between headlight switch Black 12-pin connector C1, terminal "C" (Yellow wire) and ground. See WIRING DIAGRAMS . If resistance is 5 ohms or less, go to step 8 . If resistance is greater than 5 ohms, go to step 9 .
- Check for short to ground in Yellow wire between PZM, headlight relay, headlight switch and IPC. If faulty circuit is found, go to step 12 . If circuit is okay, go to step 16 .
- Check for short to ground in Yellow wire between PZM, headlight relay, headlight switch and IPC. If faulty circuit is found, go to step 13 . If circuit is okay, go to step 16 .
- Replace headlight switch. See appropriate STEERING COLUMN SWITCHES article. After repairs, recheck headlight operation.
- Check for open in Yellow wire between PZM, headlight relay, headlight switch and IPC. If faulty circuit is found, go to step 14 . If circuit is okay, go to step 16 .
- Repair intermittent short to battery in Yellow wire between PZM, headlight relay, headlight switch and IPC. After repairs, recheck headlight operation.
- Replace the headlamp relay. After repairs, recheck headlight operation.
- Replace IPC. See appropriate ANALOG & ELECTRONIC INSTRUMENT PANELS article. After repairs, recheck headlight operation.
- Replace PZM. See PLATFORM ZONE MODULE (PZM) under REMOVAL & INSTALLATION. After repairs, recheck headlight operation.
- Check for open in White wire between PZM connector C2 terminal C16 and headlamp relay. If faulty circuit is found, go to step 12 . If circuit is okay, go to next step.
- Repair suspect wiring. After repairs, recheck headlight operation.