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Symptom: *HIGH BEAM HEADLAMPS WILL NOT TURN ON POSSIBLE CAUSES FUSED HIGH BEAM RELAY OUTPUT SHORT TO GROUND HIGH BEAM RELAY OUTPUT CKT OPEN OPEN FUSED B(+) HIIGH BEAM RELAY FUSES HIGH BEAM SWITCH SENSE OPEN HIGH BEAM RELAY CONTROL CIRCUIT OPEN BCM HIGH BEAM CONTROL CIRCUIT BCM HIGH BEAM SWITCH SENSE OPEN JUMPER HIGH BEAM SWITCH SENSE TO GROUND TEST ACTION APPLICABILITY 1 With the DRB III under Body Input Outputs read the High beam switch state while All Yes → No → 2 Check Junction Block fuses #3 and #16. All Yes → No → 3 Using an ohmmeter measure the fused high Beam relay output circuit from the #3 All Yes → Repair the fused high beam relay output for a short to ground and No → Replace the fuse(s). 4 Install a known good relay in place of the High Beam relay. All Yes → Replace the High Beam relay. No → 259 EXTERIOR LIGHTING |