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DTC B2473, High Beam Output Fault: Testing

  1. Turn ignition switch to ON position. Turn headlight switch on. Connect scan tool and select BCM TEST. Select LIGHTS, then select HIGH BEAM. Using scan tool, turn high beams on, then off. If high beams are not illuminated, go to step 4). If high beams are illuminated, go to next step.
  2. Turn ignition switch to OFF position. Remove HI/LO beam control relay. Disconnect PZM connector. Using DVOM, check voltage between HI/LO beam control relay connector terminal C9 (Orange wire) and ground. If voltage is one volt or less, go to next step. If voltage is greater than one volt, repair open or short to ground in Orange wire between HI/LO beam control and trunk compartment fuse block.
  3. Disconnect PZM connector. Using DVOM, check resistance between HI/LO beam relay connector terminal D7 (Black/White wire) and ground. If resistance is 5 ohms or less, repair short to ground in Black/White wire between PZM and HI/LO beam relay. If resistance is greater than 5 ohms, check for malfunctioning HI/LO beam relay. See appropriate wiring diagram in HEADLIGHT SYSTEMS article. If relay is okay, replace PZM.
  4. If high beams turned on in step 1), replace PZM. If high beams did not turn on in step 1), go to next step.
  5. Remove HI/LO beam relay. Using DVOM, check voltage between HI/LO beam relay connector terminal C9 (Orange wire) and ground. If voltage is greater than one volt, go to next step. If voltage is one volt or less, repair open or short to ground in Orange wire between HI/LO beam relay and trunk compartment fuse block.
  6. Using scan tool, turn high beams on. Check resistance between HI/LO beam relay connector terminal D7 (Black/White wire) and ground. If resistance is 5 ohms or less, replace HI/LO beam relay. If resistance is greater than 5 ohms, check for open in Black/White wire between PZM and HI/LO beam relay.
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