Electronic Automatic Temperature Control (EATC) Module Cold Boot Process
The purpose of the cold boot process is to allow the EATC module to re-initialize and calibrate the actuators. To carry out the cold boot process, follow the steps below.
- Clear the DTCs.
- Turn the ignition switch to the OFF position.
- Disconnect the EATC module electrical connectors.
- Inspect the module connectors for: corrosion. pushed-out pins. incorrectly seated connector.
- Wait one minute.
- Connect the EATC module electrical connectors.
- Turn the ignition switch to the ON position.
- Select any position except OFF on the EATC module.
The EATC module will not initialize and calibrate the actuators. Calibration of the actuators will take approximately 30 seconds.
| DTC | Description | Action |
|---|---|---|
| B113D | Rear climate control switch stuck | INSTALL a new rear climate control switch. TEST the system for normal operation. |
| B113E | Rear climate control switch circuit short to ground | Go to Pinpoint Test O . |
| B113F | Rear climate control switch circuit short to battery | Go to Pinpoint Test P . |
| U1178 | SCP (J1850) Invalid or missing data for climate control | REFER to MODULE COMMUNICATIONS NETWORK article to diagnose a network concern. |
REAR REDUNDANT CONTROL MODULE (RRCM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX
| DTC | EATC Self-Test Faults | Description | Action to take |
|---|---|---|---|
| B2266 | 2266 | Driver side blend door failure or short | Go to Pinpoint Test A . |
| B2267 | 2267 | Passenger side blend door failure or short | Go to Pinpoint Test A . |
| B1251 | 1251 | In-vehicle temperature sensor open circuit | Go to Pinpoint Test B . |
| B1253 | 1253 | In-vehicle temperature sensor short to ground | Go to Pinpoint Test B . |
| B1255 | 1255 | Ambient temperature sensor open circuit | Go to Pinpoint Test C . |
| B1257 | 1257 | Ambient temperature sensor short to ground | Go to Pinpoint Test C . |
| B1259 | 1259 | A/C solar radiation sensor open circuit | Go to Pinpoint Test D . |
| B1261 | 1261 | A/C solar radiation sensor circuit short to ground | Go to Pinpoint Test D . |
| B1242 | 1242 | Recirc door short/failure | Go to Pinpoint Test E . |
| B1263 | 1263 | Panel/defrost door short/failure | Go to Pinpoint Test F . |
| B1264 | 1264 | Floor door short/failure | Go to Pinpoint Test F . |
| B2268 | 2268 | Steering wheel auxiliary control switch open circuit | If vehicle is not equipped with steering wheel control switches, ignore this code and continue diagnosis. If vehicle is equipped with steering wheel control switches, go to Pinpoint Test G . |
| B2269 | 2269 | Steering wheel auxiliary control switch circuit short to ground | Go to Pinpoint Test G . |
| U1040 | 1040 | SCP invalid or missing data for function read vehicle speed | If DTCs are present in the powertrain control module (PCM), REFER to Introduction - Gasoline Engines article and diagnose the DTCs. If DTCs are present in the instrument cluster, REFER to INSTRUMENT CLUSTER article and diagnose the DTCs. If this DTC is only present in the EATC module, ignore code and continue diagnostics. |
| U1073 | N/A | SCP invalid or missing data for engine coolant | If DTCs are present in the powertrain control module (PCM), REFER to Introduction - Gasoline Engines article and diagnose the DTCs. If DTCs are present in the instrument cluster, REFER to INSTRUMENT CLUSTER article and diagnose the DTCs. If this DTC is only present in the EATC module, ignore code and continue diagnostics. |
| U1112 | 1112 | SCP invalid or missing data for interior lamps | Go to INTERIOR LIGHTING article, Inspection and Verification to continue diagnosis. |
| B1342 | 1342 | Module faulted | Button held too long may set DTC. Attempt to clean buttons. If code returns, INSTALL a new EATC module. REFER to CLIMATE CONTROL article. |
| B1200 | 1200 | Stuck button | INSTALL a new EATC module. REFER to CLIMATE CONTROL article. |
| B2477 | 2477 | Module not configured - LHD only | CONFIGURE the EATC module. REFER to MODULE CONFIGURATION article. |
| B1676 | 1676 | Voltage out of range | Go to Pinpoint Test H . |
ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX