Greetings all. I have a problem where my center stack has gone dark. It started intermittently (like once per year for three years, and over the past few weeks it has gone to malfunctioning 90% of the time.
Symptoms are: No radio or HVAC, no turn signals. The instrument cluster says "service advancetrack" and "Tire pressure monitor fault."
When I read DTCs with Forscan, I don't have communication with the GEM (aka SJB aka SPDJB aka BCM) or the APIM. I have good voltage on the B+ going from the battery junction box under the hood to the GEM, but still the GEM won't communicate. I measured the voltage at the stud at the front of the junction box.
This was the output from Forscan:
===APIM DTC Error===
Unable to read DTC
===OCS DTC None===
===RCM DTC U0253:00-0B===
Code: U0253 - Lost Communication With Accessory Protocol Interface Module
===PAM DTC None===
Successful DTC reading, no error codes found
===PCM DTC P0446-FF===
Code: P0446 - EVAP System Vent Control Circuit
===PCM DTC P1000-FF===
Code: P1000 - On-Board Diagnostic (OBD) Systems Readiness Test Not Complete
===OBDII DTC P0446-C===
Code: P0446 - EVAP System Vent Control Circuit
===ABS DTC U2023-E0===
Code: U2023 - Fault Received from External Node
===ABS DTC C1963-20===
Code: C1963 - Stability Control Inhibit Warning
===IC DTC U0140-60===
Code: U0140 - Lost Communication With BCM
===IC DTC B1137-60===
Code: B1137 - Data Not Programmed
===IC DTC U2472-20===
Code: U2472 - Unexpected Ignition State
===HVAC DTC B11E3:00-48===
===HVAC DTC B10B7:15-48===
Code: B10B7 - Rear Air Discharge Temperature
===HVAC DTC U0140:00-48===
Code: U0140 - Lost Communication With Body Control Module
===GPSM DTC U0140:00-8A===
Code: U0140 - Lost Communication With Body Control Module
===GPSM DTC U0155:00-88===
Code: U0155 - Lost Communication With Instrument Panel Cluster (IPC) Control Module
===FCIM DTC U0140-20===
Code: U0140 - Lost Communication With BCM
===FDIM DTC None===
Successful DTC reading, no error codes found
===ACM DTC None===
Successful DTC reading, no error codes found
===GEM/SJB DTC Error===
Unable to read DTC
Other functions that I think are in the GEM seem to work OK, like the keyless entry keypad and key fobs. The car starts and drives fine. I have noticed that the horn sounds normal when you press the steering wheel, but if you activate the panic alarm, it sounds quieter than normal. I checked the A-pillar ground for the SJB and it looks fine--no corrosion. I have 12.5v on fuses 14, 15 and 16 on the SJB.
Anyway, I think I'm going to take it to the shop on Monday, unless someone here has anything for me to check!
Symptoms are: No radio or HVAC, no turn signals. The instrument cluster says "service advancetrack" and "Tire pressure monitor fault."
When I read DTCs with Forscan, I don't have communication with the GEM (aka SJB aka SPDJB aka BCM) or the APIM. I have good voltage on the B+ going from the battery junction box under the hood to the GEM, but still the GEM won't communicate. I measured the voltage at the stud at the front of the junction box.
This was the output from Forscan:
===APIM DTC Error===
Unable to read DTC
===OCS DTC None===
===RCM DTC U0253:00-0B===
Code: U0253 - Lost Communication With Accessory Protocol Interface Module
===PAM DTC None===
Successful DTC reading, no error codes found
===PCM DTC P0446-FF===
Code: P0446 - EVAP System Vent Control Circuit
===PCM DTC P1000-FF===
Code: P1000 - On-Board Diagnostic (OBD) Systems Readiness Test Not Complete
===OBDII DTC P0446-C===
Code: P0446 - EVAP System Vent Control Circuit
===ABS DTC U2023-E0===
Code: U2023 - Fault Received from External Node
===ABS DTC C1963-20===
Code: C1963 - Stability Control Inhibit Warning
===IC DTC U0140-60===
Code: U0140 - Lost Communication With BCM
===IC DTC B1137-60===
Code: B1137 - Data Not Programmed
===IC DTC U2472-20===
Code: U2472 - Unexpected Ignition State
===HVAC DTC B11E3:00-48===
===HVAC DTC B10B7:15-48===
Code: B10B7 - Rear Air Discharge Temperature
===HVAC DTC U0140:00-48===
Code: U0140 - Lost Communication With Body Control Module
===GPSM DTC U0140:00-8A===
Code: U0140 - Lost Communication With Body Control Module
===GPSM DTC U0155:00-88===
Code: U0155 - Lost Communication With Instrument Panel Cluster (IPC) Control Module
===FCIM DTC U0140-20===
Code: U0140 - Lost Communication With BCM
===FDIM DTC None===
Successful DTC reading, no error codes found
===ACM DTC None===
Successful DTC reading, no error codes found
===GEM/SJB DTC Error===
Unable to read DTC
Other functions that I think are in the GEM seem to work OK, like the keyless entry keypad and key fobs. The car starts and drives fine. I have noticed that the horn sounds normal when you press the steering wheel, but if you activate the panic alarm, it sounds quieter than normal. I checked the A-pillar ground for the SJB and it looks fine--no corrosion. I have 12.5v on fuses 14, 15 and 16 on the SJB.
Anyway, I think I'm going to take it to the shop on Monday, unless someone here has anything for me to check!