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Symptom: REAR BOOSTER FAN RELAY OPEN - ATC When Monitored and Set Condition: REAR BOOSTER FAN RELAY OPEN - ATC When Monitored: With the ignition off. Set Condition: If the Integrated Power Module (IPM) detects an open on the Rear Booster Fan Relay Control circuit. POSSIBLE CAUSES B+ CIRCUIT OPEN REAR BOOSTER FAN RELAY INTEGRATED POWER MODULE (IPM) TEST ACTION APPLICABILITY 1 Turn the ignition off. All Yes → Go To 2 No → Check the B+ feed to the IPM for an open. If OK, replace the IPM in accordance with the Service Information. 2 Turn the ignition off. t, erase DTCs. Turn the ignition off. t, read IPM DTCs. Does the DRBIII t display: REAR BOOSTER FAN RELAY OPEN? All Yes → Replace the Integrated Power Module (IPM) in accordance with the Service Information. No → Replace the original Rear Booster Fan Relay in accordance with the Service Information. 605 HEATING & A/C |