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Symptom: *NO RESPONSE FROM CABIN HEATER ASSIST - DIESEL ONLY POSSIBLE CAUSES ATTEMPT TO COMMUNICATE WITH THE ECM FUSED B+ CIRCUIT OPEN GROUND CIRCUIT OPEN SCI TRANSMIT CIRCUIT OPEN CABIN HEATER ASSIST TEST ACTION APPLICABILITY 1 Turn the ignition on. All Yes → Go To 2 No → Refer to the symptom list for problems related to no communica- tion with the ECM. 2 Turn the ignition off. All Yes → Go To 3 No → Check the IPM Fuse #15 for an open. If open, check for a short to ground on the Fused B+ circuit. If not open, repair the Fused B+ 3 Turn the ignition off. All Yes → Go To 4 No → Repair the ground circuit for an open. Perform CABIN HEATER VERIFICATION TEST - VER 1. 4 Turn the ignition off. All Yes → Go To 5 No → Repair the SCI Transmit circuit for an open. Perform CABIN HEATER VERIFICATION TEST - VER 1. 367 COMMUNICATION |