HVAC Systems - Electrical Diagnostics: Diagnosis Jeep Compass I

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Scheme 1

Diagnostic Test

1. INSPECT THE A/C HEATER CONTROL FOR DAMAGE Inspect the A/C Heater Control for damage. Is the A/C Heater Control damaged? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Go To 2 .
2. INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE EBL MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the A/C Heater Control for anything that would cause the EBL mode switch to stay or stick in a pushed position. Is anything present that would cause the EBL mode switch to stay or stick in a pushed position? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Go To 3 .
3. CHECK FOR NORMAL EBL MODE SWITCH AND STATUS INDICATOR FUNCTION Turn the ignition on. Press the EBL mode switch on and off several times while observing the EBL status indicator. Does the EBL status indicator turn on and off? Yes Go To 4 . No Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
4. VERIFY THAT DTC B1016-REAR DEFROST SWITCH REQUEST INPUT CIRCUIT LOW IS STILL ACTIVE With the scan tool, erase DTCs. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait 10 minutes before proceeding. With the scan tool, read DTCs. Does the scan tool display active: B1016-REAR DEFROST SWITCH REQUEST INPUT CIRCUIT LOW? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .

Scheme 2

1. VERIFY DTC IS ACTIVE Turn the ignition on. With the scan tool, erase TIPM DTCs. Turn the ignition off, wait 10 seconds, and turn the ignition on. With the scan tool, actuate the Condenser Fan. With the scan tool, read TIPM DTCs. Does this DTC reset? Yes With the scan tool, deactuate the Condenser Fan. Then, Go To 2 . No With the scan tool, de-actuate the Condenser Fan. Then, check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, corroded, and contaminated terminals. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
2. CHECK (C123) CONDENSER FAN CONTROL OUTPUT CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the TIPM C8 harness connector. Disconnect the Condenser Fan Motor harness connector. Measure the resistance of the (C123) Condenser Fan Control Output circuit between ground and the Condenser Fan Motor harness connector. Is the resistance below 100 ohms? Yes Repair the (C123) Condenser Fan Control Output circuit for a short to ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Go To 3 .
3. CHECK FOR A SHORTED CONDENSER FAN MOTOR Reconnect the TIPM C8 harness connector. Ignition on, engine not running. With the scan tool, actuate the Condenser Fan. Using a 12-volt test light connected to ground, probe the (C123) Condenser Fan Control Output circuit at the Condenser Fan Motor harness connector. Does the test light illuminate brightly and flash on and off? Yes With the scan tool, de-actuate the Condenser Fan. Then, replace the Condenser Fan Motor in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No With the scan tool, de-actuate the Condenser Fan. Then, Go To 4 .
4. INSPECT RELATED WIRING NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Turn the ignition off. Using the schematics as a guide, inspect the related wiring harness and connectors. Pay particular attention to all Power and Ground circuits. Were any problems found? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Replace the TIPM in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .

1. VERIFY DTC IS ACTIVE Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off, wait 10 seconds, and turn the ignition on. With the scan tool, actuate the Radiator Fan. With the scan tool, read DTCs. Does the scan tool display active: B10BF-CONDENSER FAN CONTROL CIRCUIT HIGH? Yes With the scan tool, de-actuate the Radiator Fan. Then, Go To 2 . No With the scan tool, de-actuate the Radiator Fan. The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
2. CHECK (N112) HIGH SPEED RADIATOR FAN CONTROL CIRCUIT FOR A SHORT TO BATTERY VOLTAGE Turn the ignition off Disconnect the TIPM C11 harness connector. Disconnect the Radiator Fan Motor harness connector. Turn the ignition on. Using a volt meter, measure the voltage on the (N112) High Speed Radiator Fan Control circuit at the Radiator Fan Motor harness connector. Does the volt meter read 10 volts, or above? Yes Repair the (N112) High Speed Radiator Fan Control circuit for a short to battery voltage. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Go To 3 .
3. CHECK (Z823) GROUND CIRCUIT FOR AN OPEN Turn the ignition off. Reconnect the TIPM C8 harness connector. NOTE: The test light should illuminate brightly. Compare the brightness to that of a direct connection to the battery. Using a 12-volt test light connected to 12 volts, probe the (Z823) Ground circuit at the Condenser Fan Motor harness connector. Does the test light illuminate brightly? Yes Go To 4 . No Repair the excessive resistance in the (Z823) Ground circuit. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
4. CHECK RADIATOR FAN MOTOR Ignition on, engine not running. With the scan tool, actuate the Radiator Fan. Using a 12-volt test light connected to ground, probe the (C123) Condenser Fan Control Output circuit at the Condenser Fan Motor harness connector. Does the test light illuminate brightly and flash on and off? Yes With the scan tool, de-actuate the Condenser Fan. Then, replace the Condenser Fan Motor in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No With the scan tool, de-actuate the Condenser Fan. Then, Go To 5 .
5. INSPECT RELATED WIRING NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the related wiring harness and connectors. Pay particular attention to all Power and Ground circuits. Were any problems found? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Replace the TIPM in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .

1. VERIFY DTC IS ACTIVE Turn the ignition on. With the scan tool, erase TIPM DTCs. Turn the ignition off, wait 10 seconds, and turn the ignition on. With the scan tool, actuate the Condenser Fan. With the scan tool, read TIPM DTCs. Does this DTC reset? Yes With the scan tool, de-actuate the Condenser Fan. Then, Go To 2 . No With the scan tool, de-actuate the Condenser Fan. Then, check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, corroded, and contaminated terminals. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
2. CHECK (C123) CONDENSER FAN CONTROL OUTPUT CIRCUIT OPEN Turn the ignition off. Disconnect the TIPM C8 harness connector. Disconnect the Condenser Fan harness connector. Measure the resistance of the (C123) Condenser Fan Control Output circuit between the TIPM C8 harness connector and the Condenser Fan harness connector. Is the resistance below 5.0 ohms? Yes Go To 3 . No Repair the (C123) Condenser Fan Control Output circuit for an open. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
3. CHECK CONDENSER FAN MOTOR Reconnect the TIPM C8 harness connector. Ignition on, engine not running. With the scan tool, actuate the Condenser Fan. Using a 12-volt test light connected to ground, probe the (C123) Condenser Fan Control Output circuit at the Condenser Fan harness connector. Does the test light illuminate brightly and flash on and off? Yes With the scan tool, de-actuate the Condenser Fan. Then, replace the Condenser Fan Motor in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No With the scan tool, de-actuate the Condenser Fan. Then, Go To 4 .
4. INSPECT RELATED WIRING NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were any problems found? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Replace the Totally Integrated Power Module in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .

1. CHECK FOR ACTIVE DTC B1001 OR B1002 IN THE CCN Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display active: B1001 or B1002? Yes Diagnose and repair the DTC. Refer to the «DIAGNOSTIC CODE INDEX»(ref-304403-S39407764162008110700000) . No Go To 2 .
2. INSPECT THE A/C HEATER CONTROL FOR DAMAGE Turn the ignition off. Inspect the A/C Heater Control for damage. Is the A/C Heater Control damaged? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Go To 3 .
3. INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE A/C MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the A/C Heater Control for anything that would cause the A/C mode switch to stay or stick in a pushed position. Is anything present that would cause the A/C mode switch to stay or stick in a pushed position? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Go To 4 .
4. CHECK THE A/C MODE SWITCH AND STATUS INDICATOR FUNCTION Start the engine. Turn the blower control on. Press the A/C mode switch on and off several times while observing the A/C status indicator. Does the A/C status indicator turn on and off? Yes Go To 5 . No Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
5. VERIFY THAT DTC B10C1-A/C SELECT SWITCH STUCK IS STILL ACTIVE Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off, wait 10 seconds, and turn the ignition on. With the scan tool, read DTCs. Does the scan tool display active: B10C1-A/C SELECT SWITCH STUCK? Yes Replace the A/C Heater Control in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .

Scheme 3

1. VERIFY DTC B10EE-CONDENSER FAN CONTROL CIRCUIT OVERCURRENT IS ACTIVE Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off, wait 10 seconds, and turn the ignition on. With the scan tool, read DTCs. Does the scan tool display active: B10EE-CONDENSER FAN CONTROL CIRCUIT OVERCURRENT? Yes Go To 2 . No The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
2. CHECK FOR PROPER RADIATOR FAN OPERATION Turn the ignition on. With the scan tool, activate the Radiator Fan. Does the Radiator Fan operate normally? Yes Go To 4 . No Go To 3 .
3. CHECK FOR ACTIVE: B10BE-CONDENSER FAN CONTROL CIRCUIT LOW Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off, wait 10 seconds, and turn the ignition on. Use the scan tool, to activate the Condenser Fan. With the scan tool, read DTCs. Does the scan tool display active: B10BE-CONDENSER FAN CONTROL CIRCUIT LOW? Yes Follow the diagnostics for Code «B10BE-CONDENSER FAN CONTROL CIRCUIT LOW (TIPM)»(ref-304403-S36353517922008110700000) . Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Go To 4 .
4. CHECK FOR 12 VOLTS TO THE RADIATOR FAN Turn the ignition off. Disconnect the Radiator Fan harness connector. Turn the ignition on. With the scan tool, activate the Radiator Fan. Using a volt meter measure the voltage on the (N112) High Speed Radiator Fan Control circuit in the Radiator Fan harness connector. Does the volt meter read 12 volts? Yes Go To 5 . No Go To 6 .
5. CHECK FOR A BLOCKAGE STALLING THE RADIATOR FAN Turn the ignition off. Look for anything that may be physically preventing the Radiator Fan from operating normally. Is anything physically preventing Blower Motor operation? Yes Repair as necessary. Also, check the Radiator Fan for proper operation. Reinstall or replace the Radiator Fan as necessary in accordance with the service information. No Replace the Radiator Fan in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
6. CHECK FOR CHAFFING IN THE (N112) HIGH SPEED RADIATOR FAN CONTROL CIRCUIT Turn the ignition off. Check the (N112) High Speed Radiator Fan Control circuit for wire chafing. Is any wire chafing present? Yes Repair the wire chafing on the (N112) High Speed Radiator Fan Control circuit. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Replace the Totally Integrated Power Module (TIPM) in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .