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Symptom: P1641-CABIN HEATER 1 CONTROL SHORT CIRCUIT When Monitored and Set Condition: P1641-CABIN HEATER 1 CONTROL SHORT CIRCUIT When Monitored: With the ignition on and the ECM attempting to actuate the Cabin Heater Relay 1. Set Condition: The ECM detects excessive current on the Cabin Heater Relay 1 Control circuit when attempting to actuate the Cabin Heater Relay 1. POSSIBLE CAUSES INTERMITTENT CONDITION CABIN HEATER RELAY 1 CABIN HEATER RELAY 1 CONTROL CIRCUIT SHORTED TO VOLTAGE ENGINE CONTROL MODULE TEST ACTION APPLICABILITY 1 NOTE: If the ECM detects and stores a DTC, the ECM also stores the All Yes → Go To 2 No → Go To 3 188 DRIVEABILITY - DIESEL |