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DTC B2472: Low Beam Output Fault: Testing

  1. 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 are not illuminated, go to next step. If headlights are illuminated, go to step 4).
  2. Turn headlight switch on. If headlights illuminate, go to next step. If headlights do not illuminate, 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 circuit is okay, replace headlight relay.
  3. Cycle ignition. If DTC B2472 is current, check for open in Yellow wire between PZM, headlight relay, headlight switch and IPC. If circuit is okay, replace PZM. See REMOVAL & INSTALLATION. If DTC B2472 is now history, repair intermittent short to battery in Yellow wire between PZM, headlight relay, headlight switch and IPC.
  4. 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 do not illuminate, go to next step. If headlights illuminate, check for short to ground in Yellow wire between PZM, headlight relay, headlight switch and IPC. If circuit is okay, replace PZM. See REMOVAL & INSTALLATION.
  5. Disconnect headlight switch connectors. Using DVOM, measure resistance between headlight switch Black 12-pin connector C1, terminal "C" (Yellow wire) and ground. If resistance is greater than 5 ohms, replace headlight switch. If resistance is 5 ohms or less, check for short to ground in Yellow wire between PZM, headlight relay, headlight switch and IPC. If circuit is okay, replace IPC. See INSTRUMENT PANEL article.
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