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STEP 4. Check the battery power supply circuit to the The top and bottom of the headlight relay (LOW) are difficult (1) Disconnect headlight relay (LOW) connector A-28X and ZC5010400051 Relay box side: A-28X (2) Measure the voltage between terminal 4 and ground. ⦆ The voltage should measure approximately 12 volts Q:Is the measured voltage approximately 12 volts (battery positive voltage)? YES: Go to Step 5. NO: Go to Step 7. STEP 5. Check ETACS-ECU connector C-312 for loose, Q:Is ETACS-ECU connector C-312 in good condition? YES: Go to Step 6. NO: Repair the damaged parts. STEP 6. Check the wiring harness between headlight relay ⦆ Check the ground wires for open circuit. Q:Is the wiring harness between headlight relay (LOW) connector A-28X (terminal 1) and ETACS-ECU connector C-312 (terminal 6) in good condition? YES: Go to Step 8. NO: The wiring harness may be damaged or the connector (s) may have loose, corroded or damaged terminals, or STEP 7. Check the wiring harness between headlight relay ⦆ Check the power supply line for open circuit. Q:Is the wiring harness between headlight relay (LOW) connector A-28X (terminal 4) and fusible link (36) in good condition? YES: Go to Step 8. NO: The wiring harness may be damaged or the connector (s) may have loose, corroded or damaged terminals, or LIGHTING 54Ac-29 DIAGNOSIS |