A/c-Heater System - Automatic: Diagnosis Ford Expedition I

PRELIMINARY INSPECTION

1. Verify customer complaints by operating system in all available modes. Carefully check the following for possible cause of problems and repair as necessary: damaged vacuum hoses, system components, damaged compressor drive belt, open fuses, damaged/misrouted wiring circuits, and damaged/disconnected connectors.
2. Check for small leaks in vacuum circuit. Test vehicle with engine running and accelerate engine while checking airflow. During acceleration, all airflow will suddenly go to defrost outlets, indicating a small leak.
3. While checking vacuum hoses, DO NOT pinch hoses to stop vacuum flow. Instead, plug hoses with wooden golf tee for testing. Vacuum hose material will not withstand pinching.
4. If inspection reveals a problem, service as necessary and repeat preliminary inspection. If problem remains after preliminary inspection, connect New Generation Star (NGS) Tester (007-00500), or scan tool, to Data Link Connector (DLC), located beneath instrument panel. Perform DATA LINK DIAGNOSTICS test.
5. If NGS responds with NO RESPONSE/NOT EQUIPPED for EATC module, go to «TEST A»(ref-238-S29457187922000030800000) . If DATA LINK DIAGNOSTICS test is passed for EATC module, retrieve stored DTCs and perform EATC self-diagnostics. See «ENTERING SELF-DIAGNOSTICS»(ref-238-S20210386722000030800000) under SELF-DIAGNOSTICS.
6. If any DTCs are retrieved, go to «SELF-DIAGNOSTIC TEST CODE DIRECTORY»(ref-238-S39601799102000030800000) table to continue diagnostics. If EATC module cannot be accessed by NGS, go to «TEST A»(ref-238-S29457187922000030800000) .

SELF-DIAGNOSTICS

EATC module self-diagnostic test will detect problems in system control functions. It will display hard DTCs and intermittent DTCs during system operation.

Note. If EATC module cannot be accessed by NGS tester, go to TEST A . Or, if EATC module self-diagnostic test will not detect concerns associated with DLC messages, an NGS tester will have to be used to retrieve these messages.

ENTERING SELF-DIAGNOSTICS

1. Ensure coolant temperature is at least 120°F (49°C) before entering self-diagnostics. Ensure in-car temperature is between 40-90°F (4-32°C). Simultaneously depress OFF and FLOOR buttons, then press AUTOMATIC button within 2 seconds. Display will show a dashed line in the center of the display window for up to 30 seconds while test is running. Record all DTCs as displayed.
2. If DTCs are displayed, perform test indicated. See «SELF-DIAGNOSTIC TEST CODE DIRECTORY»(ref-238-S39601799102000030800000) table. If a condition exists but no DTCs are displayed, go to «SYMPTOM DIAGNOSIS»(ref-238-S41016148362000030800000) .
3. Self-diagnostics can be initiated at any time with the resulting DTCs being displayed. Normal system operation is stopped when system is in self-diagnostic mode.

SELF-DIAGNOSTIC TEST CODE DIRECTORY

EXITING SELF-DIAGNOSTICS

Note. Always exit self-diagnostic test before powering system down.

1. To exit self-diagnostics while retaining DTCs, depress Blue (cooler) temperature button. The EATC module will retain all DTCs, exit self-diagnostics and turn system off (display blank).
2. To exit self-diagnostics and clear DTCs, press DEF (defrost) button on integrated control panel. Display will show "888" for 1 second, then will go blank and all DTCs will be cleared. Any intermittent DTCs will be deleted after 80 ignition on-off cycles after condition occurs.

SYMPTOM DIAGNOSIS

1. No Communication With EATC Module Go to «TEST A»(ref-238-S29457187922000030800000) .
2. EATC System Inoperative, Intermittent Or Improper Operation Go to «TEST B»(ref-238-S29984637082000030800000) .
3. Improper/Erratic Airflow From Outlets Go to «TEST C»(ref-238-S06505088742000030800000) .
4. A/C Does Not Operate/Does Not Operate Properly Go to «TEST D»(ref-238-S12417670492000030800000) .
5. Blower Motor Does Not Operate Go to «TEST E»(ref-238-S10522364082000030800000) .
6. Blower Motor Operates Continuously In High Speed Go to «TEST F»(ref-238-S27417521712000030800000) .
7. No Operation In Some Blower Settings Go to «TEST G»(ref-238-S36217711622000030800000) .
8. Temperature Set Point Does Not Repeat After Turning Ignition Off Go to «TEST H»(ref-238-S11347397242000030800000) .
9. Temperature Display Will Not Switch Between Celsius & Fahrenheit Go to «TEST J»(ref-238-S28735882502000030800000) .
10. One Or More Steering Wheel Remote Control Buttons Inoperative Go to «TEST K»(ref-238-S37572763952000030800000) .
11. Auxiliary Blower Motor Does Not Operate Go to «TEST L»(ref-238-S11104071602000030800000) .
12. Console Blower Motor Does Not Operate Go to «TEST M»(ref-238-S09161566812000030800000) .
13. Insufficient, Erratic Or No Heat Go to «TEST N»(ref-238-S27330087992000030800000) .
14. A/C Is Always On Go to «TEST O»(ref-238-S04321937962000030800000) .
15. Insufficient A/C Cooling Go to «TEST P»(ref-238-S18365009812000030800000) .
16. Auxiliary Blower Motor Does Not Operate Properly Go to «TEST Q»(ref-238-S40377254142000030800000) .
17. Auxiliary Blower Motor Does Not Operate Using Rear Auxiliary Blower Motor Switch Go to «TEST R»(ref-238-S22166103272000030800000) .
18. Panel/Floor Control Does Not Operate Using Front/Rear Auxiliary Controls Go to «TEST S»(ref-238-S02749799692000030800000) .
19. Temperature Control Does Not Operate Using Front/Rear Auxiliary Controls Go to «TEST T»(ref-238-S30605017102000030800000) .
20. Panel/Floor & Cool/Warm Controls Do Not Operate Using Front/Rear Auxiliary Controls Go to «TEST U»(ref-238-S32694298232000030800000) .
21. Panel/Floor Switch Does Not Operate; Console Blower Does Operate Go to «TEST V»(ref-238-S15940651962000030800000) .
22. Auxiliary Controls Operate With Function Selector OFF Go to «TEST W»(ref-238-S07334481572000030800000) .
23. Rear Auxiliary Blower Motor Switch Operates Only In HI Go to «TEST X»(ref-238-S32177237232000030800000) .

TEST A: NO COMMUNICATION WITH EATC MODULE

1. Check Black Wire Circuit For Open Disconnect EATC module connector C280. With an ohmmeter, measure resistance of Black wire between EATC module connector C280 and ground. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Black wire and retest system.
2. Check Red/White Wire Circuit For Battery Voltage With a voltmeter, measure voltage of Red/White wire between EATC module connector C280 and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Red/White wire and retest system.
3. Check White/Purple Wire Circuit For Battery Voltage Turn ignition to run position (engine off). With a voltmeter, measure voltage of White/Purple wire between EATC module connector C280 and ground. If voltage is same as battery voltage, go to appropriate MODULE COMMUNICATIONS NETWORK article in ACCESSORIES & EQUIPMENT. If voltage is less than battery voltage, repair open in Purple/Brown wire and retest system.

TEST B: EATC SYSTEM INOPERATIVE, INTERMITTENT OR OPERATES IMPROPERLY

1. Perform EATC Self-Diagnostics Turn ignition to run position (engine off). Perform EATC self-diagnostics. See «ENTERING SELF-DIAGNOSTICS»(ref-238-S20210386722000030800000) under SELF-DIAGNOSTICS. If any DTCs were displayed, see «SELF-DIAGNOSTIC TEST CODE DIRECTORY»(ref-238-S39601799102000030800000) table. If no DTCs were displayed, go to next step.
2. Check Vacuum Fluorescent Display Exit self-diagnostics by pressing DEF (defrost) button. Observe symbols displayed. If the display is complete, with no missing elements, go to next step. If display is incorrect or incomplete, replace EATC module and retest system.
3. Verify Automatic Operation Press AUTOMATIC button. If AUTO appears in display window, go to next step. If AUTO does not appear in display window, go to «TEST H»(ref-238-S11347397242000030800000) .
4. Check Blower Manual Override High Speed Operation Slowly rotate blower speed control to full up (high speed) position. If blower motor speed goes smoothly to high speed, go to next step. If blower motor speed does not change properly, go to «TEST G»(ref-238-S36217711622000030800000) .
5. Verify Blower Manual Override Low Speed Operation Slowly rotate blower speed control to full down (low speed) position. If blower motor speed goes smoothly to low speed, go to next step. If blower motor speed does not change, go to «TEST F»(ref-238-S27417521712000030800000) .
6. Verify Defrost Override Operation Press DEF button. If outside air is discharged only to windshield and side window demisters, go to next step. If air is not discharged as indicated, go to «TEST C»(ref-238-S06505088742000030800000) .
7. Verify Floor Override Operation Press FLOOR mode button. If outside air is discharged from floor duct, go to next step. If air is not properly discharged from floor duct, go to «TEST C»(ref-238-S06505088742000030800000) .
8. Verify Vent Override Operation Press VENT mode button. If outside air is discharged from instrument panel registers, go to next step. If air does not flow properly from panel registers, go to «TEST C»(ref-238-S06505088742000030800000) .
9. Verify Compressor Clutch Does Not Engage In Vent Mode Press VENT mode button. If compressor clutch does not engage, go to next step. If compressor clutch engages, problem may be in PCM circuit. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
10. Verify MAX A/C Override Operation Check that ambient air temperature is above 41°F (5°C). Press MAX A/C button. If recirculated air is discharged from panel registers, go to next step. If air is not recirculated, go to «TEST C»(ref-238-S06505088742000030800000) .
11. Verify Compressor Clutch Engages In MAX A/C Mode Press MAX A/C button. If compressor clutch engages, system is operating normally. If compressor clutch does not engage, go to «TEST D»(ref-238-S12417670492000030800000) .

Scheme 7

Scheme 8

Scheme 9

Scheme 10

1. Check System Airflow Start engine and run at idle. Adjust blower speed, with blower override, to high speed. In turn, press each override button for MAX A/C, VENT, PNL/FLR, FLOOR, FLR/DEF, and DEF (defrost). Check airflow at each setting. If airflow is only from defrost outlets in all positions, go to next step. If airflow is from other than defrost outlets only, go to step 14).
2. Check Vacuum Supply Hose In engine compartment, check all vacuum hose fittings at intake manifold, A/C vacuum check valve, and power brake booster. If hose is disconnected or damaged at any of these points, repair or replace as needed. If hose connections are okay, go to next step.
3. Leak Check Vacuum Supply Hose Disconnect intake manifold vacuum supply and vacuum check valve. Plug vacuum supply hose at intake manifold end. With a vacuum tester, check hose for leaks. If hose leaks, repair or replace hose. Retest system. If hose does not leak, go to next step.
4. Check Vacuum Support Hose For Blockage Reconnect intake manifold vacuum hose. With vacuum tester on check valve end of vacuum supply hose, try to pull vacuum. If pump pulls vacuum, hose is plugged. If pump pulls partial vacuum, hose is restricted. If hose is plugged or restricted, replace blocked vacuum supply hose and retest system. If hose is not plugged or restricted, go to next step.
5. Check Vacuum Check Valve Connect vacuum check valve to original installation. Start and run engine at idle. Check vacuum check valve for blockage by removing vacuum hoses (except intake supply) and check for vacuum. If vacuum is available at the port, go to next step. If vacuum is not available, replace vacuum check valve. Retest system.
6. Leak Check Vacuum Check Valve Turn ignition off. Disconnect vacuum check valve. With vacuum tester, connect two test hoses via "T" fitting to both vacuum ports (except intake manifold port). Apply 15 in. Hg of vacuum. If vacuum leak-down exceeds 1 in. Hg per minute, remove check valve and leak test hoses. If hoses are okay, but check valve loses vacuum, replace vacuum check valve. Retest system. If vacuum check valve does not lose vacuum, go to next step.
7. Check Vacuum Reservoir Tank For Leakage Connect vacuum check valve. Disconnect vacuum reservoir tank hose from vacuum check valve. Attach vacuum tester to vacuum reservoir tank hose. Apply vacuum and observe pump gauge for leakage. If reservoir leaks, replace A/C vacuum reservoir tank and retest system. If no leak is indicated, go to next step.
8. Check Plenum Vacuum Harness Connect vacuum reservoir tank hose. Disconnect in-line vacuum harness. Plug vacuum harness supply hose after disconnecting it from vacuum check valve. (Scheme 7) Use vacuum tester to test Black vacuum supply hose at plenum harness. If vacuum leak is present, repair or replace plenum vacuum harness. If no vacuum leak is present, go to next step.
9. Check EATC Supply Hose Connect in-line vacuum harness connector. Disconnect EATC vacuum harness. Attach vacuum tester to Black vacuum supply hose at EATC vacuum harness. (Scheme 8) Pull and hold vacuum. If hose indicates a vacuum leak, repair or replace vacuum harness. If supply hose does not indicate a leak, go to next step.
10. Check EATC Module For Leakage Connect EATC vacuum harness connector. Disconnect in-line vacuum harness connector. Connect vacuum tester to Black vacuum hose and plug other hose ports at plenum vacuum harness. (Scheme 9) At each manual override mode, apply 15 in. Hg vacuum and check for leakage. If leak-down rate exceeds 1 in. Hg per minute, note manual override selection where leaks occur and go to next step. If no vacuum leaks are indicated, go to step 12).
11. Check Vacuum Harness For Leakage Ensure ignition is off. Disconnect vacuum harness connector from EATC module. Disconnect and plug one end of hose corresponding to manual override position indicating leakage. Attach vacuum tester to other end of hose and apply 15 in. Hg of vacuum. If leakage is indicated, repair or replace vacuum harness and retest system. If no leakage is indicated in vacuum harness, replace EATC module and retest system.
12. Check Plenum Vacuum Harness For Leakage Reconnect vacuum harness Black vacuum supply hose at vacuum check valve. Connect vacuum tester to Black hose in plenum vacuum harness. Try to pull vacuum. If hose is plugged or restricted, full to partial vacuum can be pulled. If hose is plugged or restricted, replace or replace plenum vacuum harness. Retest system. If hose is not plugged or restricted, go to next step.
13. Check EATC Vacuum Harness For Blockage Connect in-line vacuum harness connector. Disconnect EATC module vacuum harness connector. Connect vacuum tester to Black hose and try to pull vacuum. If pump can pull full or partial vacuum, Black hose is plugged or restricted. If hose is plugged or restricted, replace vacuum harness and retest system. If hose is okay, go to step 17).
14. Evaluate System Airflow Start and run engine at idle. Perform system operation test and evaluate airflow at each selection. If airflow is correct for each manual override button pressed, go to next step. If airflow is not correct, note selection at which incorrect airflow occurred and go to step 21).
15. Isolate Leaking Vacuum Circuit Select each manual override position and note airflow as vehicle is accelerated. If airflow goes to defrost outlets during acceleration, go to step 2). If airflow does not go to defrost during acceleration, go to next step.
16. Isolate Leaking Vacuum Circuit Select each manual override position and note airflow as vehicle is accelerated. If airflow is correct at each manual override position, system is okay at this time. If airflow is not correct for each manual override position, go to step 21).
17. Review Vehicle History Determine if EATC system functioned properly prior to this concern. If system did function properly, go to step 20). If system did not function properly prior to current concern, go to next step.
18. Check Vacuum Harness Compare vacuum hose color in each vacuum harness. (Scheme 10) If hose colors are correct, go to next step. If hose colors are incorrect, replace vacuum harness. Retest system.
19. Check Vacuum Hose Disconnect any suspect hose. Plug one end and apply vacuum to other end. If hose leaks, repair or replace hose. Retest system. If hose is okay, go to next step.
20. Check A/C Vacuum Circuit Perform visual inspection of all vacuum hoses and check for kinked or damaged hoses. If hoses are kinked or damaged, reposition, repair or replace hoses as needed. Retest system. If hoses are okay, go to next step.
21. Check Vacuum Circuit Connections Turn ignition off. Check each vacuum hose connection corresponding to manual override selection noted in previous step. If hose is disconnected, reconnect hose. Retest system. If hoses are properly connected, go to next step.
22. Check Plenum Hoses Disconnect in-line vacuum harness connector. With vacuum tester, apply vacuum to port in plenum harness corresponding to suspect override position. If vacuum leaks, go to next step. If no vacuum leak is found, go to step 24).
23. Check Vacuum Control Motor Disconnect vacuum hose for vacuum motor corresponding to manual override selection where leaks were noted. Attach vacuum tester and apply vacuum. If vacuum control motor holds vacuum, replace plenum vacuum harness and retest system. If vacuum control motor leaks, replace motor and retest system.
24. Check Vacuum Control Motor Installation Check attachment of vacuum control motor arm to damper door. If arm is properly attached to damper door, go to next step. If arm is not properly attached, reconnect vacuum control motor arm to damper door crank arm and retest system.
25. Check Damper Door Movement Disconnect vacuum control motor. Check travel and movement of door(s) corresponding to manual override selection previously noted. If door moves smoothly through full travel, go to next step. If door does not move smoothly, repair damper door. Retest system.
26. Check Vacuum Motor Hoses Connect vacuum tester to each vacuum motor hose at plenum vacuum harness port and pull vacuum. If full or partial vacuum can be pulled, hose is plugged or restricted. If hose is plugged or restricted, replace plenum vacuum harness. Retest system. If hoses are okay, go to next step.
27. Check Vacuum Harness Hoses Connect in-line vacuum harness connector. Connect vacuum tester to each hose of EATC vacuum connector and try to pull vacuum. If full or partial vacuum can be pulled, hose is plugged or restricted. If hose is plugged or restricted, replace EATC vacuum harness. Retest system. If hoses are okay, go to next step.
28. Check EATC Assembly Connect all vacuum motors. Reconnect EATC vacuum harness connector. Disconnect in-line vacuum harness connector. Start and run engine at idle. Connect vacuum tester to Black vacuum supply hose. Plug all other ports at plenum harness connector. Apply 15 in. Hg of vacuum. Check for vacuum leakage. If vacuum leak-down exceeds 1 in. Hg per minute, note override selection where leak occurs and go to next step. If leak-down is less than 1 in. Hg per minute, system is functioning properly. Retest system.
29. Leak Test Vacuum Harness Turn ignition off. Disconnect EATC vacuum harness connector. Plug one end of hose corresponding to suspect manual override selection indicating a leak. Apply 15 in. Hg of vacuum to other end of hose. If vacuum leak occurs, repair or replace vacuum harness. Retest system. If no vacuum leak occurs, replace EATC module. Retest system.

TEST D: A/C DOES NOT OPERATE OR DOES NOT OPERATE PROPERLY

1. Check PID WACF With A/C Off Ensure ambient temperature is above 50°F (10°C). Turn ignition to run position (engine off). Turn EATC system to OFF. Perform PCM Parameter Identification WOT A/C Primary Circuit Fault (PID WACF) test. If PID WACF reads YES, perform PCM self-diagnostics test. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If PID WACF does not read YES, go to next step. NOTE: If PID WACF reads YES, this is the same fault as DTC P1460.
2. Check PID WACF With A/C On Start engine and run at idle. Set EATC system to MAX A/C position. Perform PCM PID WACF. If PID WACF reads YES, perform PCM self-diagnostics test. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If PID WACF does not read YES, go to next step.
3. Check PID ACCS With A/C On Run engine at idle. Set EATC system to MAX A/C position. Perform PCM Parameter Identification A/C Cycling Switch (PID ACCS) input. If PID ACCS reads ON, go to next step. If PID ACCS does not read ON, go to step 5) .
4. Check PID ACCS With A/C On Set EATC system to MAX A/C position. Perform PCM PID ACCS. If PID ACCS reads ON, go to step 15) . If PID ACCS does not read ON, perform PCM self-diagnostics test. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
5. Check Power Input To PCM Turn ignition off. Disconnect PCM 104-pin Gray harness connector (C174). Connect Breakout Box (014-00950) to PCM harness connector. DO NOT connect to PCM. Turn ignition to run (engine off). Set EATC panel to MAX A/C position. Using voltmeter, measure voltage at breakout box pin No. 41. If voltage is more than 10 volts, replace PCM. Retest system. If voltage is less than 10 volts, go to next step.
6. Check Refrigerant System Pressure Turn ignition off. Connect manifold gauge set. If refrigerant system pressure is 50-250 psi (3.5-17.6 kg/cm 2 ), go to next step. If refrigerant system pressure is not 50-250 psi (3.5-17.6 kg/cm 2 ), leak test system. Repair as necessary. Retest system.
7. Check Violet Wire Circuit For Open Disconnect EATC module harness connector. Disconnect A/C pressure cut-off switch harness connector. Using ohmmeter, measure resistance of Violet wire between cut-off switch and EATC module. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Violet wire. Retest system.
8. Check Violet Wire Circuit For Short To Ground Measure resistance of Violet wire between cut-off switch connector and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair short to ground in Violet wire. Retest system.
9. Check A/C Pressure Cut-Off Switch Voltage Reconnect EATC module connector. Turn ignition to run (engine off). Set EATC panel to MAX A/C position. Measure voltage of Violet wire between cut-off switch connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, replace EATC module. Retest system.
10. Check Red/Yellow Wire Circuit For Short Disconnect A/C cycling switch harness connector. Measure resistance of Red/Yellow wire between cycling switch and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair short in Red/Yellow wire. Retest system.
11. Check Red/Yellow Wire Circuit For Open Measure resistance of Red/Yellow wire between cycling switch connector and pressure cut-off switch connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Red/Yellow wire. Retest system.
12. Check Voltage At A/C Cycling Switch Turn ignition off. Reconnect A/C cycling switch connector. Turn ignition to run (engine off). Measure voltage of Red/Yellow wire between A/C cycling switch connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, replace pressure cut-off switch. Retest system.
13. Check Black/Yellow Wire Circuit For Short Turn ignition off. Measure resistance of Black/Yellow wire between cycling switch connector and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair short to ground in Black/Yellow wire. Retest system.
14. Check Black/Yellow Wire Circuit For Open Measure resistance of Black/Yellow wire between A/C cycling switch connector and breakout box pin No. 41. If resistance is less than 5 ohms, replace cycling switch. Retest system. If resistance is more than 5 ohms, repair open in Black/Yellow wire. Retest system.
15. Check Light Blue/Pink Wire Circuit For Short Turn ignition off. Disconnect A/C Wide Open Throttle (WOT) relay harness connector (located in battery junction box, in engine compartment). Remove fuse No. 5 (15-amp) from passenger compartment fuse block. Measure resistance of Light Blue/Pink wire between relay connector and ground. If resistance is less than 10,000 ohms, repair short to ground in Light Blue/Pink wire. If resistance is more than 10,000 ohms, go to next step.
16. Check Light Blue/Pink Wire Circuit For Open Turn ignition to run (engine off). Measure voltage of Light Blue/Pink wire between WOT relay connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts or less, repair open in Light Blue/Pink wire. Retest system.
17. Check A/C Clutch Relay Turn ignition off. Reconnect WOT relay connector. Disconnect A/C clutch coil connector. Turn ignition to run (engine off). Check fuse No. 5 (15-amp) in fuse block. If fuse is blown, go to next step. If fuse is okay, go to step 21) .
18. Check Gray/White Wire Circuit For Short Turn ignition off. Disconnect A/C WOT relay harness connector. Measure resistance of Gray/White wire between relay connector and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, replace relay. Retest system.
19. Check A/C Clutch Diode Disconnect A/C clutch diode harness connector (located in battery junction box, in engine compartment). Measure resistance of Gray/White wire between relay connector and ground. If resistance is less than 10,000 ohms, repair short in Gray/White wire. Retest system. If resistance is more than 10,000 ohms, replace A/C clutch diode.
20. Check A/C Clutch Input Turn ignition off. Reconnect A/C WOT relay. Disconnect A/C clutch coil harness connector. Turn ignition to run (engine off). Using New Generation Star Tester (007-00500), place tester in ACTIVE COMMAND MODE. Command PCM outputs ON. Measure voltage of Gray/White wire between A/C clutch oil connector and ground. If voltage is more than 10 volts, go to step 22) . If voltage is less than 10 volts, go to next step.
21. Check Gray/White Wire Circuit For Open Turn ignition off. Disconnect A/C WOT relay harness connector. Measure resistance of Gray/White wire between relay connector and A/C clutch coil connector. If resistance is less than 5 ohms, replace WOT relay. Retest system. If resistance is more than 5 ohms, repair open in Gray/White wire. Retest system.
22. Check Black Wire Circuit For Open Turn ignition off. Measure resistance of Black wire between A/C WOT relay connector and ground. If resistance is less than one ohm, replace A/C clutch coil. Retest system. If resistance is more than one ohm, repair open in Black wire. Retest system.

TEST E: BLOWER MOTOR DOES NOT OPERATE

1. Check Blower Speed Controller Supply Voltage Disconnect blower speed controller connector, located under right side of instrument panel. Turn ignition to run position (engine off). Press AUTOMATIC button on EATC panel. With a voltmeter, measure voltage of Brown/Yellow wire between blower speed controller connector and ground. If voltage is more than 9 volts, go to step 15) . If voltage is less than 9 volts, go to next step.
2. Check Blower Motor Relay Voltage Turn ignition off. Disconnect blower motor relay connector. Measure voltage of Black/Light Green wire between blower motor relay connector and ground. If voltage is greater than 9 volts, go to step 8) . If voltage is less than 9 volts, go to next step.
3. Check Fuse No. 23 (30-Amp) Remove and check fuse No. 23 (30-amp) located in engine compartment power distribution box. If fuse is okay, repair open in Black/Light Green wire. Retest system. If fuse is blown, go to next step.
4. Check Black/Light Green Wire Circuit For Short With an ohmmeter, measure resistance of Black/Light Green wire between blower motor relay connector and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair short in Black/Light Green wire. Retest system.
5. Check Brown/Yellow Wire Circuit For Short Measure resistance of Brown/Yellow wire between blower motor relay connector and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair short in Brown/Yellow wire. Retest system.
6. Check Blower Motor Current Draw Disconnect blower motor connector. Connect ammeter between right blower motor connector and known-good battery. If blower motor current draw is 9.2 amps or less, go to next step. If blower motor current draw is greater than 9.2 amps, replace blower motor. Retest system.
7. By-Pass Blower Motor Relay Reconnect blower motor connector. Reconnect blower speed controller connector. Reinstall fuse No. 23 (30-amp). Connect jumper wire between blower motor relay terminals No. 30 (Brown/Yellow wire) and 87 (Black/Light Green wire). If fuse No. 23 blows, replace blower speed controller. Retest system. If fuse No. 23 does not blow, replace blower motor relay. Retest system.
8. Check Relay Supply Voltage Turn ignition to run position (engine off). Measure voltage of White/Purple wire between blower motor relay connector and ground. If voltage is more than 9 volts, go to next step. If voltage is less than 9 volts, go to step 12) .
9. Check Orange Wire Circuit For Open Turn ignition off. Disconnect EATC 20-pin module connector (C280). Measure resistance of Orange wire between blower motor relay connector and EATC module connector C280. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Orange wire. Retest system.
10. Check Brown/Yellow Wire Circuit For Open Measure resistance of Brown/Yellow wire between blower speed controller connector and blower motor relay connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Brown/Yellow wire. Retest system.
11. By-Pass EATC Module Connect blower motor relay connector. Turn ignition to run position (engine off). Connect jumper wire between EATC module connector C280 terminal No. 17 (Orange wire) and ground. Measure voltage of Brown/Yellow wire between blower motor speed controller connector and ground. If voltage is more than 9 volts, replace EATC module. Retest system. If voltage is less than 9 volts, replace blower motor relay. Retest system.
12. Check Fuse No. 24 (30-Amp) Remove and check fuse No. 24 (30-amp) located in junction box fuse/relay panel. If fuse is okay, repair open in White/Purple wire. Retest system. If fuse is blown, go to next step.
13. Check White/Purple Wire Circuit For Short Disconnect EATC 20-pin module connector (C280). Measure resistance of White/Purple wire between EATC module connector and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair short in White/Purple wire. Retest system.
14. Check Blower Motor Relay For Short Reinstall fuse No. 24 (30-amp). Reconnect EATC module connector C280. Turn ignition to run position (engine off). If fuse No. 24 blows, replace EATC module. Retest system. If fuse does not blow, replace blower motor relay. Retest system.
15. By-Pass Blower Speed Controller Turn ignition off. Disconnect blower motor connector. Turn ignition to run position (engine off). Connect 12-gauge jumper wire between blower speed controller connector to blower motor terminals (Brown/Yellow wire terminal and Black wire terminal). If blower motor runs at high speed, go to step 19) . If blower does not run at high speed, go to next step.
16. Check Brown/White Wire Circuit For Open Turn ignition off. Disconnect blower speed controller connector. Measure resistance of Brown/White wire between blower speed controller supply circuit connector and blower motor connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Brown/White wire. Retest system.
17. Check Red/White Wire Circuit For Open Measure resistance of Red/White wire between blower speed controller connector and blower motor connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Red/White wire. Retest system.
18. Check Blower Speed Controller Ground Circuit For Open Measure resistance of Black wire between blower speed controller connector and ground. If resistance is less than 5 ohms, replace blower motor. Retest system. If resistance is more than 5 ohms, repair open in Black wire. Retest system.
19. Check EATC Blower Speed Signal Turn ignition to run position (engine off). Press MAX A/C button. Rotate blower speed to HI position. Measure voltage of Tan/Orange wire between blower speed controller connector and ground. If voltage is more than 4 volts, replace blower speed controller. Retest system. If voltage is less than 4 volts, go to next step.
20. Check Tan/Orange Wire For Open Turn ignition off. Disconnect EATC module connector (C281). Measure resistance of Tan/Orange wire between EATC module connector C281 and blower speed controller connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Tan/Orange wire. Retest system.
21. Check Tan/Orange Wire For Short Measure resistance of Tan/Orange wire between EATC connector C281 and ground. If resistance is more than 10,000 ohms, replace EATC module. Retest system. If resistance is less than 10,000 ohms, repair short to ground in Tan/Orange wire. Retest system.

TEST F: BLOWER MOTOR OPERATES CONTINUOUSLY IN HIGH SPEED

1. Check Blower Motor Operation Turn ignition to run position (engine off). Press MAX A/C button. Adjust blower speed control to LO position. If blower speed reduces, system is functioning properly. Retest system. If blower speed does not reduce, go to next step.
2. Check Tan/Orange Wire Circuit For Short Turn ignition off. Disconnect blower motor speed controller connector. Turn ignition to run position (engine off). Press OFF button on EATC control panel. Measure voltage of Tan/Orange wire between blower motor speed controller connector and ground. If voltage is more than zero volts, repair short to power in Tan/Orange wire. Retest system. If voltage is zero volts, go to next step.
3. Check Blower Motor Speed Controller Turn ignition off. Connect blower motor speed controller connector. Turn ignition to run position (engine off). Press MAX A/C button. Adjust blower speed to LO position. Without disconnecting blower motor speed controller connector, connect jumper wire between Tan/Orange wire terminal from blower speed controller connector to ground. If blower motor operation stops or slows noticeably, go to next step. If blower motor operation did not stop, replace blower motor speed controller. Retest system.
4. Check Tan/Orange Wire Circuit For Open With jumper still connected, turn ignition off. Disconnect EATC module connector (C281). Turn ignition to run position (engine off). If blower motor operation stops or slows noticeably, replace EATC module. Retest system. If blower motor operation does not change, repair open in Tan/Orange wire. Retest system.

TEST G: BLOWER MOTOR DOES NOT OPERATE IN SOME SETTINGS

1. Inspect Connectors Turn ignition off. Disconnect EATC module connector (C281). Disconnect blower motor speed controller connector. Inspect Tan/Orange wire pins in both connectors for signs of damage or looseness. If damage or looseness is noted, repair connector pins. Retest system. If pins are okay, replace EATC module. Retest system.
2. Check Blower Motor Operation Turn ignition to run position (engine off). Press MAX A/C button. Adjust blower speed setting from LO to HI position. If blower speed increases with movement of blower speed override from LO to HI position, system is functioning properly at this time. If blower speed does not increase with movement of blower speed override from LO to HI position, go to next step.
3. Check Blower Speed Controller Input Voltage Turn ignition off. Disconnect EATC module connector (C281). Turn ignition to run position (engine off). With a voltmeter, measure voltage of Tan/Orange wire between EATC module connector C281 and ground. If voltage is more than 4.6 volts, go to step 6) . If voltage is less than 4.6 volts, go to next step.
4. Check Tan/Orange Wire For Short Turn ignition off. Disconnect blower motor speed controller connector. With an ohmmeter, measure resistance of Tan/Orange wire between EATC module connector C281 and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair short to ground in Tan/Orange wire. Retest system.
5. Check Tan/Orange Wire For Open Measure resistance of Tan/Orange wire between EATC module connector C281 and blower speed controller connector. If resistance is less than 5 ohms, replace blower motor speed controller. Retest system. If resistance is more than 5 ohms, repair open in Tan/Orange wire. Retest system.
6. Check For Disruption In Control Signal Turn ignition off. Reconnect EATC module connector (C281). Without disconnecting blower motor speed controller connector, use a voltmeter to measure voltage of Tan/Orange wire between blower motor speed controller connector and ground. Note voltage. Turn ignition to run position (engine off). Press MAX A/C button. Adjust blower speed to HI position. Slowly adjust blower speed downward, observing voltmeter. Watch for disruption as voltage decreases. Voltage should decrease in steps from 5 volts to a point less than 1 volt. If voltage decreased without disruption, system is functioning normally. If there were disruptions in voltage, replace EATC module. Retest system.

TEST H: TEMPERATURE SET POINT DOES NOT REPEAT AFTER TURNING IGNITION OFF

1. Check Memory Backup Supply To EATC Module Turn ignition off. Disconnect EATC module connector C280. With a voltmeter, measure voltage of Red/White wire between EATC module connector C280 and ground. If voltage is more than 10 volts, replace EATC module. Retest system. If voltage is less than 10 volts, go to next step.
2. Check Red/White Wire For Open Remove fuse No. 2 (5-amp) located in instrument panel fuse box. With an ohmmeter, measure resistance of Red/White wire between EATC module connector C280 and right terminal of fuse No. 2 fuse box socket. If resistance is less than 5 ohms, replace EATC module. Retest system. If resistance is more than 5 ohms, repair open in Red/White wire. Retest system.

TEST J: TEMPERATURE DISPLAY WILL NOT SWITCH BETWEEN CELSIUS & FAHRENHEIT

1. Check EATC Display Turn ignition to run position (engine off). Press AUTOMATIC button. Press MAX A/C and DEF buttons simultaneously for at least .75 second. If display changed between °F and °C, system is functioning properly at this time. If display did not change between °C and °F, replace EATC module. Retest system.

TEST K: ONE OR MORE STEERING WHEEL CONTROL SWITCHES IS INOPERATIVE

1. Check Input To EATC Turn ignition off. Disconnect EATC harness connector (C281). Using ohmmeter, measure resistance of Brown/Light Blue wire between module connector and ground. If resistance is between 1500-5000 ohms, go to next step. If resistance is not between 4500-5000 ohms, go to step 3) .
2. Check Steering Wheel Control Switch Output Measure resistance of Brown/Light Blue wire between EATC module connector and ground, while pressing each steering wheel control switch button. Compare readings with «STEERING WHEEL SWITCH RESISTANCE SPECIFICATIONS»(ref-238-S02808661852000030800000) table. If readings are within range, replace EATC module. Retest system. If readings are not within specification, replace steering wheel switch assembly. STEERING WHEEL SWITCH RESISTANCE SPECIFICATIONS Switch Position Resistance (Ohms) Temp Up 336-375 Temp Down 1620-1810 Fan Up 736-821 Fan Down 123-138
3. Check System For Open Measure resistance of Brown/Light Blue wire between EATC module connector and ground. If resistance is less than 4500 ohms, go to next step. If resistance is more than 4500 ohms, go to step 7) .
4. Check For Short To Ground Measure resistance of Brown/Light Blue wire between EATC module connector and ground. If resistance is less than 10,000 ohms, repair short to ground in Brown/Light Blue wire. If resistance is more than 10,000 ohms, go to next step.
5. Check Steering Wheel Switch For Short To Ground Disconnect steering wheel control switch harness connector. Measure resistance of Light Blue/Red wire between switch connector and ground. If resistance is less than 10,000 ohms, go to next step. If resistance is more than 10,000 ohms, replace steering wheel switch module. Retest system.
6. Check Steering Wheel Switch In-Line Connector For Short To Ground Disconnect steering wheel switch in-line harness connector. Measure resistance of Light Blue/Red wire between switch in-line connector and ground. If resistance is less than 10,000 ohms, repair steering wheel switch harness. If resistance is more than 10,000 ohms, replace air bag sliding contact assembly. Retest system.
7. Check Ground Supply To Steering Wheel Switches Disconnect air bag sliding contact harness connector. Measure resistance of Dark Green/Orange wire between sliding contact connector and ground. If resistance is less than 5 ohms, go to step 9) . If resistance is more than 5 ohms, go to next step.
8. Check Dark Green/Orange Wire Circuit For Open Disconnect speed control servo module harness connector. Measure resistance of Dark Green/Orange wire between air bag sliding contact connector and speed control module connector. If resistance is less than 5 ohms, replace speed control module. Retest system. If resistance is more than 5 ohms, repair open in Dark Green/Orange wire. Retest system.
9. Check Brown/Light Green Wire Circuit For Open Measure resistance of Brown/Light Green wire between air bag sliding contact connector and EATC module connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Brown/Light Blue wire. Retest system.
10. Check Steering Wheel Switch For Open Disconnect steering wheel switch harness connector. Measure resistance of Light Blue/Red wire between air bag sliding contact connector and steering wheel switch connector. If resistance is less than 5 ohms, replace steering wheel switch. Retest system. If resistance is more than 5 ohms, go to next step.
11. Check Clockspring For Open Disconnect steering wheel switch in-line harness connector. Measure resistance of Brown/Light Blue wire between air bag sliding contact connector and steering wheel switch in-line to clockspring connector. If resistance is less than 5 ohms, replace steering wheel switch. Retest system. If resistance is more than 5 ohms, replace air bag sliding contact assembly. Retest system.

TEST L: AUXILIARY BLOWER MOTOR DOES NOT OPERATE

1. Check Fuse No. 13 (30-Amp) Check power distribution box fuse No. 13. If fuse is okay, go to step 7) . If fuse is blown, go to next step.
2. Verify Auxiliary Blower Motor Is Inoperative Replace fuse No. 13. Turn ignition to run position (engine off). Press MAX A/C button. Place front auxiliary blower motor switch in HI position. If auxiliary blower motor operates, system is okay. If auxiliary blower motor does not operate, go to next step.
3. Check Fuse No. 13 (30-Amp) Turn ignition off. Check fuse No. 13 again. If fuse is okay, go to step 7) . If fuse is blown, go to next step.
4. Check Auxiliary Blower Motor For Short Turn ignition off. Disconnect auxiliary blower motor connector. Turn ignition to run position (engine off). Press MAX A/C button. Measure resistance of Black/Light Green wire between auxiliary blower motor and ground. If resistance is more than 10,000 ohms, replace auxiliary blower motor. Retest system. If resistance is less than 10,000 ohms, go to next step.
5. Check Black/Light Green Wire Circuit For Short Turn ignition off. Disconnect auxiliary blower motor relay connector. Measure resistance of Black/Light Green wire between auxiliary blower motor and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair Black/Light Green wire. Retest system.
6. Check Pink/White Wire Circuit For Short Measure resistance of Pink/White wire between auxiliary blower motor relay and ground. If resistance is more than 10,000 ohms, replace auxiliary blower motor relay. Retest system. If resistance is less than 10,000 ohms, repair Pink/White wire. Retest system.
7. Check Fuse No. 7 (5-Amp) Check instrument panel fuse block fuse No. 7 (5-amp). If fuse is okay, go to step 11) . If fuse is blown, go to next step.
8. Check Auxiliary Blower Motor Operation Replace fuse No. 7. Turn ignition to run position (engine off). Press MAX A/C button. Place front auxiliary blower motor switch in HI position. If auxiliary blower motor operates, system is okay at this time. If auxiliary blower motor does not operate, go to next step.
9. Recheck Fuse No. 7 (5-Amp) Turn ignition off. Check fuse No. 7. If fuse is okay, go to step 11) . If fuse is blown, go to next step.
10. Check Pink/Light Blue Circuit Wire For Short Disconnect auxiliary blower motor relay. Measure resistance of Pink/Light Blue wire between auxiliary blower motor relay connector and ground. If resistance is more than 10,000 ohms, replace relay. Retest system. If resistance is less than 10,000 ohms, repair open in Pink/Light Blue wire. Retest system.
11. Check White/Violet Wire Circuit For Open Remove fuse No. 7. Turn ignition to run (engine off). Measure voltage between fuse junction panel No. 7 socket and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair White/Violet wire. Retest system.
12. Check Auxiliary Blower Motor Turn ignition off. Reinstall fuse No. 7. Disconnect auxiliary blower motor harness connector. Turn ignition to run (engine off). Press MAX A/C button. Place front auxiliary blower motor switch in HI position. Measure voltage between Black/Light Green and Orange/Red wire terminals of blower motor connector. If voltage is more than 10 volts, replace auxiliary blower motor. If voltage is less than 10 volts, go to next step.
13. Check Voltage To Auxiliary Blower Motor Measure voltage between Black/Light Green wire of auxiliary blower motor connector and ground. Measure voltage of Orange/Red wire between blower motor connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to step 16) .
14. Check Black Wire Circuit For Open Turn ignition off. Disconnect front auxiliary blower motor switch harness connector. Measure resistance of Black wire between switch connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Black wire. Retest system.
15. Check Orange/Red Wire Circuit For Open Measure resistance of Orange/Red wire between auxiliary blower motor connector and front auxiliary blower motor switch connector. If resistance is less than 5 ohms, replace blower motor switch. If resistance is less than 5 ohms, repair Orange/Red wire. Retest system.
16. Check Pink/White Wire Circuit For Open Disconnect auxiliary blower motor relay harness connector. Measure voltage of Pink/White wire between relay connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair Pink/White wire. Retest system.
17. Check Voltage To Auxiliary Blower Motor Relay Measure voltage between Yellow/Black wire and Pink/Light Blue wire terminals of blower motor relay connector. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to step 19) .
18. Check Black/Light Green Wire Circuit For Open Turn ignition off. Measure resistance of Black/Light Green wire between auxiliary blower motor relay connector and auxiliary blower motor connector. If resistance is less than 5 ohms, replace blower motor relay. If resistance is more than 5 ohms, repair Black/Light Green wire.
19. Check Pink/Light Blue Wire Circuit For Open Measure voltage of Pink/Light Blue wire between auxiliary blower motor relay connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair Pink/Light Blue wire. Retest system.
20. Check Yellow/Black Wire Circuit For Open Turn ignition off. Disconnect EATC module harness connector C281 (14-pin connector). Measure resistance of Yellow/Black wire between auxiliary blower motor relay connector and EATC module connector. If resistance is less than 5 ohms, replace blower motor relay. If resistance is more than 5 ohms, repair Yellow/Black wire. Retest system.

TEST M: CONSOLE BLOWER MOTOR DOES NOT OPERATE

1. Check Fuse No. 7 (5-Amp) Check fuse No. 7 (5-amp) located in junction box fuse/relay panel. If fuse is okay, go to step 7) . If fuse is blown, go to next step.
2. Test System For Normal Operation Replace fuse No. 7. Turn ignition to run (engine off). Place function selector switch in MAX A/C position. Place blower motor switch in HI position. If console blower motor operates, system is functioning normally. If console blower motor does not operate, go to next step.
3. Recheck Fuse No. 7 Turn ignition off. Recheck fuse No. 7. If fuse is okay, go to step 7) . If fuse is blown, go to next step.
4. Check Console Blower Motor For Short Replace fuse No. 7. Disconnect console blower motor harness connector. Turn ignition to run (engine off). Set EATC panel to MAX A/C position. Turn ignition off. Check fuse No. 7. If fuse is okay, replace console blower motor. Retest system. If fuse is blown, go to next step.
5. Check Yellow/Red Wire Circuit For Short Turn ignition off. Disconnect console blower relay connector. Measure resistance of Yellow/Red wire between console blower motor connector and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair Yellow/Red wire. Retest system.
6. Check Pink/Light Blue Wire Circuit For Short Measure resistance of Pink/Light Blue wire between console blower motor relay connector and ground. If resistance is less than 5 ohms, replace console blower motor relay. If resistance is more than 5 ohms, repair Pink/Light Blue wire. Retest system.
7. Check White/Violet Wire Circuit For Battery Power Remove fuse No. 7. Measure voltage of White/Violet wire between instrument panel fuse block fuse No. 7 cavity and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair White/Violet wire. Retest system.
8. Check Console Blower Motor Turn ignition off. Reinstall fuse No. 7. Disconnect console blower motor connector. Turn ignition to run (engine off). Set EATC panel to MAX A/C position. Place blower motor switch in HI position. Measure voltage between console blower motor connector Brown and Yellow/Red wire terminals. If voltage is more than 10 volts, replace console blower motor. If voltage is less than 10 volts, go to next step.
9. Check Yellow/Red Wire Circuit For Voltage Measure voltage of Yellow/Red wire between console blower motor connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to step 14) .
10. Check Console Blower Motor Resistor Ground Turn ignition off. Disconnect console blower motor resistor connector. Measure resistance of Orange/Black wire between console blower motor resistor connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, go to step 12) .
11. Check Brown Wire Circuit For Open Measure resistance of Brown wire between console blower motor resistor connector and console blower motor connector. If resistance is less than 5 ohms, replace console blower motor resistor. If resistance is more than 5 ohms, repair Brown wire. Retest system.
12. Check Black Wire Circuit For Open Disconnect Rear Integrated Control Panel (RICP) connector located at rear of center console. Measure resistance of Black wire between RIPC connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Black wire. Retest system.
13. Check Orange/Black Wire Circuit For Open Measure resistance of Orange/Black wire between console blower motor resistor connector and RICP connector. If resistance is less than 5 ohms, replace RICP module. Retest system. If resistance is more than 5 ohms, repair Orange/Black wire. Retest system.
14. Check Console Blower Relay For Battery Power Disconnect console blower relay connector. Measure voltage between console blower relay connector Pink/Light Blue wire and Yellow/Black wire terminals. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to step 17) .
15. Check Light Blue Wire Circuit For Battery Power Measure voltage of Light Blue wire between console blower relay connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair Light Blue wire. Retest system.
16. Check Yellow/Red Wire Circuit For Open Turn ignition off. Measure resistance of Yellow/Red wire between console blower relay connector and console blower motor connector. If resistance is less than 5 ohms, replace console blower relay. If resistance is more than 5 ohms, repair Yellow/Red wire. Retest system.
17. Check Pink/Light Blue Wire Circuit For Open Measure voltage of Pink/Light Blue wire between console blower relay connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair Pink/Light Blue wire. Retest system.
18. Check Yellow/Black Wire Circuit For Open Turn ignition off. Disconnect EATC module connector (C281). Measure resistance of Yellow/Black wire between console blower relay connector and EATC module connector. If resistance is less than 5 ohms, replace EATC module. Retest system. If resistance is more than 5 ohms, repair Yellow/Black wire. Retest system.

TEST N: INSUFFICIENT, ERRATIC OR NO HEAT

1. Check For Proper Coolant Level Check coolant level with engine hot and cold. If coolant level is not okay, replace coolant and check for leaks. If coolant level is okay, go to next step.
2. Check For Hot Coolant To Heater Inlet Start and run engine to normal operating temperature. Check for hot water to heater core inlet hose by feeling heater hose at inlet tube to heater core. If hose is too hot to handle, go to step 4) . If hose is cool to touch, check cooling system and repair as needed. Ensure inlet hose flow restrictor is in place and is not damaged. Repair as necessary.
3. Check For Cooling System Leaks Ensure coolant reservoir is filled to proper level. Perform cooling system pressure checks. If all components of cooling system hold pressure, go to next step. If a leak is found, repair or replace components as necessary.
4. Check For Hot Coolant At Heater Outlet Ensure engine is running at normal operating temperature. Carefully feel heater core outlet hose. If heater core outlet hose is cool or cold, test heater core for plugged or restricted condition. Repair or replace components as necessary. If outlet hose is hot, go to «TEST A»(ref-238-S29457187922000030800000) .

TEST O: A/C IS ALWAYS ON

1. Check PID WACF With A/C Off Turn ignition to run position (engine off). Turn A/C system off. Perform PCM Parameter Identification WOT A/C Primary Circuit Fault (PID WACF) test. If PID WACF reads YES, repair Pink/Yellow wire between PCM and wide open throttle relay connector. If PID WACF does not read YES, go to next step.
2. Check Gray/White Wire Circuit For Short To Battery Turn ignition off. Disconnect A/C clutch coil connector. Turn ignition to run (engine off). Using New Generation Star Tester (007-00500) in ACTIVE COMMAND MODE, command PCM outputs OFF. Using voltmeter, measure voltage of Gray/White wire between A/C clutch coil connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, check and adjust clutch air gap to .014-.033" (.35-.85 mm).
3. Check A/C Clutch Relay Turn ignition off. Disconnect A/C clutch relay connector. Turn ignition to run (engine off). Measure voltage of Gray/White wire between clutch coil connector and ground. If voltage is more than 10 volts, repair short to battery in Gray/White wire. Retest system. If voltage is less than 10 volts, replace A/C clutch relay. Retest system.

TEST P: INSUFFICIENT A/C COOLING

1. Vehicle Set-Up Connect manifold gauge set. Start and run engine at 1500 RPM. Set EATC panel to MAX A/C position. Set blower/fan on high speed and close doors and windows. Insert thermometer in center vent. Operate system for 10-15 minutes to allow system to stabilize. When vehicle has stabilized, proceed with tests.
2. Check Center Register Discharge Temperature Check and record center register and ambient temperature. Compare readings with «AMBIENT/CENTER REGISTER TEMPERATURE SPECIFICATIONS»(ref-238-S09359009172000030800000) table. If readings are within specifications, system is functioning normally. If readings are not within specifications, go to next step. AMBIENT/CENTER REGISTER TEMPERATURE SPECIFICATIONS Ambient Temp. °F (°C) Center Register Temp. °F (°C) 60 (16) 33-47 (0.6-8) 70 (21) 33-47 (0.6-8) 80 (27) 33-47 (0.6-8) 90 (32) 33-47 (0.6-8) 100 (38) 36-48 (2-9)
3. Check For Normal Discharge Pressure Check and record ambient temperature and compressor discharge (high) pressure. Compare readings with «AMBIENT TEMPERATURE/DISCHARGE PRESSURE SPECIFICATIONS»(ref-238-S11322449962000030800000) table. If readings are within specifications, go to next step. If readings are not within specifications, go to step 9) . AMBIENT TEMPERATURE/DISCHARGE PRESSURE SPECIFICATIONS Ambient Temp. °F (°C) Discharge Pressure psi (kg/cm 2 ) 60 (16) 75-175 (5-12) 70 (21) 100-200 (7-14) 80 (27) 125-225 (9-16) 90 (32) 150-250 (11-18) 100 (38) 175-350 (12-25)
4. Check Low Pressure Performance Check and record ambient temperature and compressor suction (low) pressure. Compare readings with «AMBIENT TEMPERATURE/SUCTION PRESSURE SPECIFICATIONS»(ref-238-S37350756072000030800000) table. If readings are within specifications, go to next step. If readings are not within specifications, go to step 7) . AMBIENT TEMPERATURE/SUCTION PRESSURE SPECIFICATIONS Ambient Temp. °F (°C) Suction Pressure psi (kg/cm 2 ) 60 (16) 24-45 (2-3) 70 (21) 24-45 (2-3) 80 (27) 24-45 (2-3) 90 (32) 24-45 (2-3) 100 (38) 38-60 (3-4)
5. Check For Slow Or Continuous Run Clutch Cycle Rate Check and record ambient temperature and total compressor clutch cycle time (time on plus time off) in seconds. Compare readings with «AMBIENT TEMPERATURE/CLUTCH CYCLE TIME SPECIFICATIONS»(ref-238-S28534860542000030800000) table. If readings are above upper limit of specification, go to next step. If readings are within specification, repair evaporator core for partial restriction or plugged condition. Retest system. AMBIENT TEMPERATURE/CLUTCH CYCLE TIME SPECIFICATIONS Ambient Temp. °F (°C) Clutch Cycle Time (Seconds) 60 (16) 28-50 70 (21) 30-65 80 (27) 45-120 90 (32) 95-Continuous
6. Check For Long Or Continuous Clutch Off Time Check and record ambient temperature and total compressor off time in seconds. Compare readings with «AMBIENT TEMPERATURE/CLUTCH OFF TIME SPECIFICATIONS»(ref-238-S10471125602000030800000) table. If readings are above upper limit of specification, repair system for excessive moisture or refrigerant oil condition. Retest system. If readings are within specification, go to step 8) . AMBIENT TEMPERATURE/CLUTCH OFF TIME SPECIFICATIONS Ambient Temp. °F (°C) Clutch Off time (Seconds) 60 (16) 17-24 70 (21) 14-23 80 (27) 2-17 90 (32) 2-3
7. Check For High Suction Pressure If readings in step 4) are above upper limit of specification, repair evaporator core orifice for missing or damaged (leaking) "O" rings. Retest system. If readings in step 4) are not above upper limit of specification, replace A/C cycling switch for low cut-out condition. Retest system.
8. Check Ambient Temperature Refer to readings obtained in step 6) . If ambient temperature is above 80°F (27°C), this is normal operation for refrigerant system in high humidity conditions. If ambient temperature is not above 80°F (27°C), repair system for overcharge condition. Retest system.
9. Check For High Discharge Pressure Refer to readings obtained in step 3) . If reading is above upper limit of specification, go to next step. If reading is not above upper limit of specification, go to step 12) .
10. Check For Normal Low Pressure Check and record ambient temperature and compressor suction (low) pressure. Compare readings with «AMBIENT TEMPERATURE/SUCTION PRESSURE SPECIFICATIONS»(ref-238-S37350756072000030800000) table. If readings are within specifications, repair engine for overheating condition. Retest system. If readings are not within specifications, go to next step.
11. Check For Normal-To-Low Section Pressure Refer to readings obtained in step 10) . If reading is below lower limit of specification, repair evaporator core orifice for partially restricted or plugged condition. Retest system. If reading is not below lower limit of specification, repair condenser core for partially blocked or inadequate airflow condition. Retest system.
12. Check For Normal Suction Pressure Check and record ambient temperature and compressor suction (low) pressure. Compare readings with «AMBIENT TEMPERATURE/SUCTION PRESSURE SPECIFICATIONS»(ref-238-S37350756072000030800000) table. If readings are within specification, go to next step. If readings are not within specification, go to step 16) .
13. Check For Slow Clutch Cycle Rate Check and record ambient temperature and total compressor clutch cycle time (time on plus time off) in seconds. Compare readings with «AMBIENT TEMPERATURE/CLUTCH CYCLE TIME SPECIFICATIONS»(ref-238-S28534860542000030800000) table. If readings are above upper limit of specification, repair evaporator-to-compressor suction line for partially restricted or plugged condition. Retest system. If readings are within specification, go to next step.
14. Check For Normal Clutch Off Time Check and record ambient temperature and total compressor off time in seconds. Compare readings with «AMBIENT TEMPERATURE/CLUTCH OFF TIME SPECIFICATIONS»(ref-238-S10471125602000030800000) table. If reading is within specifications, repair evaporator core for low or restricted air flow. Retest system. If readings are not within specifications, go to next step.
15. Check For Long Clutch Off Time Refer to readings obtained in step 14) . If reading is above upper limit of specification, repair condenser core for partially or plugged condition. Retest system. If reading is not above upper limit specification, repair system for low refrigerant condition.
16. Check For Missing Evaporator Core Orifice Discharge A/C system, using approved refrigerant recovery/recycling equipment. Remove condenser-to-evaporator tube. Check for presence of fixed orifice tube. If fixed orifice tube is missing, install Orange colored orifice tube. Retest system. If fixed orifice tube is not missing, repair A/C compressor for low performance. Retest system.

TEST Q: AUXILIARY BLOWER MOTOR DOES NOT OPERATE PROPERLY

1. Check Auxiliary Blower Motor Resistor Thermal Limiter Turn ignition off. Disconnect auxiliary blower motor resistor. Measure resistance between auxiliary blower motor resistor terminals No. 2 (Red/Pink wire) and 3 (Orange/Red wire). Resistance should be 5.5-8.5 ohms. Measure resistance between terminals No. 1 (Light Blue/Orange wire) and 3. Resistance should be 2.5-4.0 ohms. Measure resistance between terminals No. 3 and 4 (Dark Blue/White wire). Resistance should be .5-.7 ohms. If all resistances are correct, go to next step. If any resistance is incorrect, replace auxiliary blower motor resistor. Retest system.
2. Check Voltage To Auxiliary Blower Motor Resistor Turn ignition to run (engine off). Place function selector in MAX A/C position. Place front auxiliary blower motor switch in OFF position. Place rear auxiliary blower motor switch in OFF position. Using voltmeter, measure voltage of Orange/Red wire between auxiliary blower motor resistor connector and ground. If voltage is more than 10 volts, go to step 5) . If voltage is less than 10 volts, go to next step.
3. Check Orange/Red Wire Circuit For Open Turn ignition off. Measure resistance of Orange/Red wire between auxiliary blower motor resistor and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair open in Orange/Red wire. Retest system.
4. Check Orange/Red Wire Circuit For Short Disconnect front auxiliary blower motor switch connector. Measure resistance of Orange/Red wire between auxiliary blower motor resistor and ground. If resistance is more than 10,000 ohms, replace front auxiliary blower motor switch. Retest system. If resistance is less than 10,000 ohms, repair Orange/Red wire.
5. Check Voltage To Front Auxiliary Blower Motor Switch Turn ignition off. Disconnect front auxiliary blower motor switch connector. Turn ignition to run (engine off). Place function selector in MAX A/C position. Measure voltage of Orange/Red wire between front auxiliary blower motor switch connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair Orange/Red wire. Retest system.
6. Check Dark Blue/White Wire Circuit Measure resistance of Dark Blue/White wire between auxiliary blower motor resistor and front auxiliary blower motor switch. Measure resistance of Dark Blue/White wire between auxiliary blower motor resistor and ground. If resistance is less than 5 ohms between connectors and more than 10,000 between connector and ground, go to next step. If resistance is not as specified, repair Dark Blue/White wire. Retest system.
7. Check Light Blue/Orange Wire Circuit Measure resistance of Light Blue/Orange wire between auxiliary blower motor resistor and front auxiliary blower motor switch. Measure resistance of Light Blue/Orange wire between auxiliary blower motor resistor and ground. If resistance is less than 5 ohms between connectors and more than 10,000 between connector and ground, go to next step. If resistance is not as specified, repair Light Blue/Orange wire. Retest system.
8. Check Red/Pink Wire Circuit Measure resistance of Red/Pink wire circuit between auxiliary blower motor resistor connector and ground. If resistance is greater than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair Red/Pink wire. Retest system.
9. Check Black/White Wire Circuit Measure resistance of Black/White wire circuit between auxiliary blower motor switch connector and ground. If resistance is greater than 10,000 ohms, replace front auxiliary blower motor switch. Retest system. If resistance is less than 10,000 ohms, repair Black/White wire. Retest system.

TEST R: AUXILIARY BLOWER MOTOR DOES NOT OPERATE USING REAR AUXILIARY BLOWER MOTOR SWITCH

1. Check Auxiliary Blower Motor Resistor Thermal Limiter Turn ignition off. Disconnect auxiliary blower motor resistor. Measure resistance between auxiliary blower motor resistor terminals No. 2 (Red/Pink wire) and 3 (Orange/Red wire). Resistance should be 5.5-8.5 ohms. Measure resistance between terminals No. 1 (Light Blue/Orange wire) and 3. Resistance should be 2.5-4.0 ohms. Measure resistance between terminals No. 3 and 4 (Dark Blue/White wire). Resistance should be .5-.7 ohms. If all resistances are correct, go to next step. If any resistance is incorrect, replace auxiliary blower motor resistor. Retest system.
2. Check Front Auxiliary Blower Motor Switch Disconnect rear auxiliary blower motor switch connector. Turn ignition to run (engine off). Place function selector to MAX A/C position. Place front auxiliary blower motor switch in OFF position. Using voltmeter, measure resistance of Orange/Red wire between rear auxiliary blower motor switch and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair Orange/Red wire. Retest system.
3. Check Red/Pink Wire Circuit For Open Turn ignition off. Measure resistance of Red/Pink wire between auxiliary blower motor resistor connector and rear blower motor switch connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Red/Pink wire. Retest system.
4. Check Rear Auxiliary Blower Motor Switch Place front auxiliary blower motor switch in REAR position. Measure resistance of Black/White wire between rear auxiliary blower motor switch connector and ground. If resistance is less than 5 ohms, replace rear auxiliary blower motor switch. If resistance is more than 5 ohms, go to next step.
5. Check Black/White Wire Circuit For Open Disconnect front auxiliary blower motor switch connector. Measure resistance of Black/White wire between front auxiliary blower motor switch connector and rear auxiliary blower motor switch connector. If resistance is less than 5 ohms, replace front auxiliary blower motor switch. Retest system. If resistance is more than 5 ohms, repair Black/White wire. Retest system.

TEST S: PANEL/FLOOR CONTROL DOES NOT OPERATE USING FRONT/REAR AUXILIARY CONTROLS

1. Check Front Auxiliary Mode Control Operation Turn ignition to run (engine off). Place front auxiliary blower switch in HI position. Rotate front auxiliary mode control from PANEL to FLOOR. If airflow control operates correctly, go to next step. If airflow control does not operate correctly, go to step 8) .
2. Test System For Normal Operation Place front auxiliary blower switch in REAR position. Place rear auxiliary blower switch in HI position. Rotate front auxiliary mode control from PANEL to FLOOR. If rear airflow control operates correctly, system is okay at this time. If rear airflow control does not operate correctly, go to next step.
3. Check Pink/Light Green Wire Circuit Turn ignition off. Disconnect rear auxiliary mode potentiometer connector. Disconnect auxiliary climate control module connector. Measure resistance of Pink/Light Green wire between auxiliary mode potentiometer connector and auxiliary climate control module connector. Measure resistance of Pink/Light Green wire between auxiliary climate control module connector and ground. If resistance is less than 5 ohms between connectors and more than 10,000 ohms between connector and ground, go to next step. If resistances are not as specified, repair Pink/Light Green wire. Retest system.
4. Check Gray/Light Blue Wire Circuit Disconnect auxiliary mode actuator connector. Measure resistance of Gray/Light Blue wire between rear auxiliary mode potentiometer and auxiliary mode actuator connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Gray/Light Blue wire. Retest system.
5. Check Brown/White Wire Circuit Measure resistance of Brown/White wire between rear auxiliary mode potentiometer connector and rear auxiliary actuator connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Brown/White wire. Retest system.
6. Check Rear Auxiliary Mode Potentiometer Measure resistance between Gray/Light Blue and Pink/Light Green terminals of rear mode potentiometer connector. If resistance is between 4000-6000 ohms, go to next step. If resistance is not 4000-6000 ohms, replace rear auxiliary mode potentiometer. Retest system.
7. Check Rear Auxiliary Mode Potentiometer Wiper Measure resistance between Gray/Light Blue and Brown/White terminals of rear mode potentiometer connector while rotating potentiometer. If resistance varies, replace auxiliary climate control module. Retest system. If resistance does not vary, replace rear auxiliary mode potentiometer.
8. Check Rear Auxiliary Mode Control Operation Place front auxiliary blower motor switch in REAR position. Place rear auxiliary blower switch in HI position. Rotate rear mode control from PANEL to FLOOR. If control operates correctly, go to next step. If control does not operate correctly, go to step 14) .
9. Check Yellow/White Wire Circuit Turn ignition off. Disconnect front auxiliary mode potentiometer connector. Disconnect auxiliary climate control module connector. Measure resistance of Yellow/White wire between front potentiometer connector and climate control module connector. Measure resistance of Yellow/White wire between climate control module connector and ground. If resistance is less than 5 ohms between connectors and more than 10,000 ohms between connector and ground, go to next step. If resistances are not as specified, repair Yellow/White wire. Retest system.
10. Check Front Auxiliary Potentiometer Disconnect auxiliary mode actuator connector. Measure resistance of Gray/Light Blue wire between front auxiliary mode potentiometer and auxiliary mode actuator connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Gray/Light Blue wire. Retest system.
11. Check Front Auxiliary Potentiometer Brown/White Wire Circuit Measure resistance of Brown/White wire between front auxiliary mode potentiometer connector and auxiliary actuator connector. If resistance is less than 5 ohms, go to step 18) . If resistance is more than 5 ohms, repair Brown/White wire. Retest system.
12. Check Front Auxiliary Mode Potentiometer Measure resistance between Brown/White wire and Yellow/White wire terminals of front mode potentiometer connector. If resistance is between 4000-6000 ohms, go to step 18) . If resistance is not 4000-6000 ohms, replace front auxiliary mode potentiometer. Retest system.
13. Check Front Auxiliary Mode Potentiometer Wiper Measure resistance between front auxiliary mode potentiometer connector Gray/Light Blue wire and Yellow/White wire while rotating front auxiliary mode potentiometer. If resistance varies, replace auxiliary A/C control module. Retest system. If resistance does not vary, replace front auxiliary mode potentiometer. Retest system.
14. Check White/Light Blue Wire Circuit Turn ignition off. Disconnect auxiliary mode actuator connector. Turn ignition to run (engine off). Measure voltage of White/Light Blue wire between mode actuator connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair White/Light Blue wire. Retest system.
15. Check Black Wire For Open Measure resistance of Black wire between auxiliary mode actuator and ground. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Black wire. Retest system.
16. Check Light Green Wire Circuit Measure resistance of Light Green wire between auxiliary climate control module connector and auxiliary mode actuator connector. Measure resistance of Light Green wire between auxiliary mode actuator connector and ground. If resistance is less than 5 ohms between connectors and more than 10,000 ohms between connector and ground, go to next step. If resistances are not as specified, repair Light Green wire. Retest system.
17. Check Gray/Light Blue Wire Circuit Disconnect front auxiliary mode potentiometer connector. Disconnect rear auxiliary mode potentiometer connector. Measure resistance of Gray/Light Blue wire between auxiliary mode actuator connector and rear auxiliary mode potentiometer connector. Measure resistance of Gray/Light Blue wire between auxiliary mode actuator connector and ground. If resistance is less than 5 ohms between connectors and more than 10,000 ohms between connector and ground, go to next step. If resistances are not as specified, repair Gray/Light Blue wire. Retest system.
18. Check Brown/White Wire Circuit Measure resistance of Brown/White wire between auxiliary mode actuator connector and rear auxiliary mode potentiometer connector. Measure resistance of Brown/White wire between auxiliary mode actuator connector and ground. If resistance is less than 5 ohms between connectors and more than 10,000 ohms between connector and ground, go to next step. If resistances are not as specified, repair Brown/White wire. Retest system.
19. Check Pink/Light Green Wire Circuit For Short Measure resistance of Pink/Light Green wire between auxiliary climate control module connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Pink/Light Green wire. Retest system.
20. Check Yellow/White Wire Circuit For Short Measure resistance of Yellow/White wire between auxiliary climate control module connector and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair Yellow/White wire. Retest system.
21. Check Auxiliary Mode Actuator Reconnect auxiliary mode actuator connector. Turn ignition to run (engine off). Place front auxiliary blower switch in HI position. Connect jumper wire between climate control connector White/Light Blue and Light Green wire terminals. If mode actuator directs airflow to panel, replace auxiliary climate control module. Retest system. If airflow is not directed to panel, go to next step.
22. Check Auxiliary Mode Actuator Connect jumper wire between climate control connector Black and Light Green wire terminals. If mode actuator directs airflow to floor, replace auxiliary climate control module. Retest system. If airflow is not directed to panel, replace auxiliary mode actuator. Retest system.

TEST T: TEMPERATURE CONTROL DOES NOT OPERATE USING FRONT/REAR AUXILIARY CLIMATE CONTROLS

1. Verify System Turn ignition to run (engine off). Place front auxiliary blower switch in HI position. Rotate front auxiliary temperature control from COOL to WARM. If front auxiliary control operates properly, go to next step. If control does not operate properly, go to step 8) .
2. Test System For Normal Operation Place rear auxiliary blower motor switch in REAR position. Place rear blower switch in HI position. Rotate auxiliary temperature control from COOL to WARM. If rear auxiliary control operates properly, system is okay at this time. If control does not operate properly, go to next step.
3. Check Yellow Wire Circuit Turn ignition off. Disconnect rear auxiliary blend potentiometer connector. Disconnect auxiliary climate control module connector. Measure resistance of Yellow wire between rear auxiliary potentiometer connector and auxiliary climate control module connector. Measure resistance of Yellow wire between auxiliary climate control module connector and ground. If resistances between connectors is less than 5 ohms and more than 10,000 ohms between connector and ground, go to next step. If resistances are not as specified, repair Yellow wire. Retest system.
4. Check White Wire Circuit Disconnect auxiliary blend actuator connector. Measure resistance of White wire between rear auxiliary blend potentiometer connector and auxiliary blend actuator. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair White wire. Retest system.
5. Check Brown Wire Circuit Measure resistance of Brown wire between rear auxiliary blend potentiometer connector and auxiliary blend actuator connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Brown wire. Retest system.
6. Check Rear Auxiliary Blend Potentiometer Measure resistance between Brown wire and Yellow wire terminals of rear auxiliary blend potentiometer connector. If resistance is between 4000-6000 ohms, go to next step. If resistance is not between 4000-6000 ohms, replace rear auxiliary blend potentiometer. Retest system.
7. Check Rear Auxiliary Blend Potentiometer Wiper Measure resistance between Brown wire and White wire terminals of rear auxiliary blend potentiometer connector while rotating potentiometer. If resistance varies, replace auxiliary climate control module. Retest system. If resistance does not vary, replace rear auxiliary blend potentiometer. Retest system.
8. Check Rear Auxiliary Temperature Control Operation Place front auxiliary blower motor switch in REAR position. Place rear blower switch in HI position. Rotate auxiliary temperature control from COOL to WARM. If rear temperature control operates properly, go to next step. If control does not operate properly, go to step 14) .
9. Check Red Wire Circuit Turn ignition off. Disconnect front auxiliary blend potentiometer connector. Disconnect auxiliary climate control module connector. Measure resistance of Red wire between front auxiliary potentiometer connector and auxiliary climate control module connector. Measure resistance of Red wire between auxiliary climate control module connector and ground. If resistances between connectors is less than 5 ohms and more than 10,000 ohms between connector and ground, go to next step. If resistances are not as specified, repair Red wire. Retest system.
10. Check White Wire Circuit Disconnect auxiliary blend actuator connector. Measure resistance of White wire between front auxiliary blend potentiometer connector and auxiliary blend actuator. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair White wire. Retest system.
11. Check Front Auxiliary Potentiometer Brown Wire Circuit Measure resistance of Brown wire between front auxiliary blend potentiometer connector and auxiliary blend actuator connector. If resistance is less than 5 ohms, go to step 18) . If resistance is more than 5 ohms, repair Brown wire. Retest system. .
12. Check Front Auxiliary Blend Potentiometer Measure resistance between White wire and Red wire terminals of front auxiliary blend potentiometer connector. If resistance is between 4000-6000 ohms, go to next step. If resistance is not between 4000-6000 ohms, replace front auxiliary blend potentiometer. Retest system.
13. Check Front Auxiliary Blend Potentiometer Wiper Measure resistance between Brown wire and White wire terminals of front auxiliary blend potentiometer connector while rotating potentiometer. If resistance varies, replace auxiliary climate control module. Retest system. If resistance does not vary, replace front auxiliary blend potentiometer. Retest system.
14. Check Voltage To Auxiliary Blend Actuator Turn ignition off. Disconnect auxiliary blend actuator connector. Measure voltage of White/Light Blue wire between auxiliary blend actuator connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair White/Light Blue wire. Retest system.
15. Check Black Wire Circuit For Open Measure resistance of Black wire between auxiliary blend actuator connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Black wire. Retest system.
16. Check Light Blue Wire Circuit Measure resistance of Light Blue wire between auxiliary blend actuator connector and auxiliary climate control module connector. Measure resistance of Light Blue wire between auxiliary blend actuator connector and ground. If resistances between connectors is less than 5 ohms and more than 10,000 ohms between connector and ground, go to next step. If resistances are not as specified, repair Light Blue wire. Retest system.
17. Check White Wire Circuit Disconnect front auxiliary Blend potentiometer connector. Disconnect rear auxiliary blend potentiometer connector. Measure resistance of White wire between auxiliary blend actuator connector and rear auxiliary blend potentiometer connector. Measure resistance of White wire between auxiliary blend actuator connector and ground. If resistances between connectors is less than 5 ohms, and more than 10,000 ohms between connector and ground, go to next step. If resistances are not as specified, repair White wire. Retest system.
18. Check Brown Wire Circuit Measure resistance of Brown wire between auxiliary blend actuator connector and rear auxiliary blend potentiometer connector. Measure resistance of Brown wire between auxiliary blend actuator connector and ground. If resistances between connectors is less than 5 ohms and more than 10,000 ohms between connector and ground, go to next step. If resistances are not as specified, repair Brown wire. Retest system.
19. Check Yellow Wire Circuit For Short Measure resistance of Yellow wire between auxiliary climate control module connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Yellow wire. Retest system.
20. Check Red Wire For Short Measure resistance of Red wire between auxiliary climate control module connector and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair Red wire. Retest system.
21. Check Auxiliary Blend Actuator Reconnect auxiliary blend actuator connector. Turn ignition to run (engine off). Place front auxiliary blower switch in HI position. Connect jumper wire between White/Light Blue wire and Light Blue wire terminals of auxiliary climate control module connector. If auxiliary blend actuator operates, replace auxiliary climate control module. Retest system. If actuator does not operate, go to next step.
22. Check Auxiliary Blend Actuator Connect jumper wire between Black wire and Light Blue wire terminals of auxiliary climate control module connector. If auxiliary blend actuator operates, replace auxiliary climate control module. Retest system. If actuator does not operate, replace auxiliary blend actuator. Retest system.

TEST U: PANEL/FLOOR & COOL/WARM CONTROLS DO NOT OPERATE ON FRONT/REAR AUXILIARY CONTROLS

1. Check Fuse No. 23 (10-Amp) Turn ignition off. Check fuse No. 23 (10-amp). If fuse is okay, go to step 10) . If fuse is blown, go to next step.
2. Check System Operation Replace fuse No. 23. Operate front and rear controls through all positions. If auxiliary A/C mode and blend door actuators operate using both front and rear controls, system is okay. If auxiliary A/C mode and blend door actuators do not operate using both front and rear controls, go to next step.
3. Recheck Fuse No. 23 (10-Amp) Turn ignition off. Inspect fuse No. 23. If fuse is okay, go to step 10) . If fuse is blown, go to next step.
4. Check White/Light Blue Wire Circuit For Short Disconnect auxiliary climate control module connector, auxiliary blend actuator connector and auxiliary mode actuator connector. Disconnect flasher relay connector located under instrument panel at right side of steering column. On 2WD models, disconnect 4x2 center axle disconnect solenoid connector located in left side of engine compartment (if equipped). On 4WD models, disconnect 4x4 center axle disconnect solenoid connector located in left side of engine compartment (if equipped). On all models, disconnect trailer tow battery charge relay located in battery junction box in engine compartment (if equipped). Measure resistance of White/Light Blue wire between auxiliary climate control module connector and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair White/Light Blue wire. Retest system.
5. Check Trailer Tow Battery Charge Relay For Short Turn ignition to run (engine off). Reconnect trailer tow battery charge relay (if equipped). Turn ignition off. Check fuse No. 23 (10-amp). If fuse No. 23 is okay, go to next step. If fuse is blown, replace trailer tow battery charge relay. Retest system.
6. Check Center Axle Disconnect Solenoids Turn ignition to run (engine off). Reconnect 4x2 or 4x4 center axle disconnect solenoid connectors (if equipped). Turn ignition off. Check fuse No. 23. If fuse is okay, go to next step. If fuse is blown, problem is in transfer case circuit wiring.
7. Check Flasher Relay For Short Turn ignition to run (engine off). Reconnect flasher relay connector. Turn ignition off. Check fuse No. 23. If fuse is okay, go to next step. If fuse is blown, replace flasher relay.
8. Check Auxiliary Blend Door Actuator For Short Turn ignition to run position (engine off). Reconnect auxiliary blend actuator connector. Turn ignition off. Check fuse No. 23. If fuse is okay, go to next step. If fuse is blown, replace auxiliary blend actuator. Retest system.
9. Check Auxiliary Mode Actuator For Short Turn ignition to run position (engine off). Reconnect auxiliary mode actuator connector. Check fuse No. 23. If fuse is okay, replace auxiliary climate control module. Retest system. If fuse is blown, replace auxiliary mode actuator. Retest system.
10. Check Auxiliary Climate Control Module For Voltage Disconnect auxiliary climate control module connector. Turn ignition to run (engine off). Measure voltage of White/Light Blue wire between climate control connector and ground. If voltage is more than 10 volts, go to step 13) . If voltage is less than 10 volts, repair White/Light Blue wire. Retest system.
11. Check Black Wire For Open Turn ignition off. Measure resistance of Black wire between climate control connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Black wire. Retest system.
12. Check Front Auxiliary Control Enable Signal Place front auxiliary blower switch in OFF position. Measure resistance of Dark Green/Yellow wire between climate control connector and ground. If resistance is more than 10,000 ohms, go to step 14) . If resistance is less than 10,000 ohms, go to next step.
13. Check Dark Green/Yellow Wire Circuit For Short Measure resistance of Dark Green/Yellow wire between climate control connector and ground. If resistance is less than 10,000 ohms, replace front auxiliary blower motor switch. Retest system. If resistance is more than 10,000 ohms, repair Dark Green/Yellow wire. Retest system.
14. Check Rear Auxiliary Control Enable Signal Place front auxiliary blower switch in REAR position. Measure resistance of Dark Green/Yellow wire between climate control connector and ground. If resistance is less than 5 ohms, replace auxiliary climate control module. Retest system. If resistance is more than 5 ohms, go to next step.
15. Check Dark Green/Yellow Wire Circuit For Open Disconnect front auxiliary blower motor switch connector. Measure resistance of Dark Green/Yellow wire between auxiliary climate control module connector and front auxiliary blower motor switch connector. If resistance is less than 5 ohms, replace front auxiliary blower motor switch. Retest system. If resistance is more than 5 ohms, repair Dark Green/Yellow wire. Retest system.

TEST V: PANEL/FLOOR SWITCH DOES NOT OPERATE; CONSOLE BLOWER DOES OPERATE

1. Check Fuse No. 23 (10-Amp) Turn ignition off. Check fuse No. 23. If fuse is okay, go to next step. If fuse is blown, go to step 11) .
2. Check System Operation Replace fuse No. 23. Turn ignition to run (engine off). Cycle rear blower switch from HI to OFF. If console blend door actuator operates, system is okay at this time. If blend door does not operate, go to next step.
3. Recheck Fuse No 23 (10-Amp) Turn ignition off. Check fuse No. 23. If fuse is okay, go to step 8) . If fuse is blown, go to next step.
4. Check White/Light Blue Wire Circuit For Short Disconnect Rear Integrated Control Panel (RICP) connector. Disconnect flasher relay connector (located under instrument panel, at right side of steering column). On 2WD models, disconnect 4x2 center axle disconnect solenoid connector located in left side of engine compartment (if equipped). On 4WD models, disconnect 4x4 center axle disconnect solenoid connector located in left side of engine compartment (if equipped). On all models, disconnect trailer tow battery charge relay located in battery junction box in engine compartment (if equipped). Measure resistance of White/Light Blue wire between RICP connector and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair White/Light Blue wire. Retest system.
5. Check Trailer Tow Battery Charge Relay For Short Turn ignition to run (engine off). Reconnect trailer tow battery charge relay (if equipped). Turn ignition off. Check fuse No. 23 (10-amp). If fuse No. 23 is okay, go to next step. If fuse is blown, replace trailer tow battery charge relay. Retest system.
6. Check Center Axle Disconnect Solenoid For Short Turn ignition to run (engine off). Reconnect 4x2 or 4x4 center axle disconnect solenoid connectors (if equipped). Turn ignition off. Check fuse No. 23. If fuse is okay, go to next step. If fuse is blown, problem is in transfer case circuit wiring.
7. Check Flasher Relay For Short Turn ignition to run (engine off). Reconnect flasher relay connector. Turn ignition off. Check fuse No. 23. If fuse is okay, go to next step. If fuse is blown, replace flasher relay.
8. Check Yellow/Light Green Wire Circuit For Short Disconnect console door actuator connector. Measure resistance of Yellow/Light Green wire between RICP connector and ground. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair Yellow/Light Green wire. Retest system.
9. Check Red/White Wire Circuit For Short Measure resistance of Red/White wire between RICP connector and ground. If resistance is more than 10,000 ohms, reconnect RICP and go to next step. If resistance is less than 10,000 ohms, repair Red/White wire. Retest system.
10. Check RICP For Short Place RICP fan switch in HI position. Measure resistance of Red/White wire between console door actuator connector and ground. If resistance is more than 10,000 ohms, replace console door actuator. Retest system. If resistance is less than 10,000 ohms, replace RICP. Retest system.
11. Check Voltage To RICP Disconnect RICP connector. Turn ignition to run (engine off). Measure voltage of White/Light Blue wire between RICP connector and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair White/Light Blue wire. Retest system.
12. Check Red/White Wire Circuit For Open Turn ignition off. Disconnect console blend door actuator. Measure resistance of Red/White wire between console blend actuator connector and RICP connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Red/White wire. Retest system.
13. Check Yellow/Light Green Wire For Open Measure resistance of Yellow/Light Green wire between console blend actuator connector and RICP connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair Yellow/Light Green wire. Retest system.
14. Check RICP Place rear blower switch in HI position. Measure resistance between Black wire and Yellow/Light Green wire terminals of RICP connector. Measure resistance between White/Light Blue wire and Red/White wire terminals of RICP connector. If resistances are less than 5 ohms, replace console blend door actuator. Retest system. If resistances are more than 5 ohms, replace RICP. Retest system.

TEST X: REAR AUXILIARY BLOWER MOTOR SWITCH OPERATES ONLY IN HI POSITION

Replace auxiliary blower motor resistor.

TESTING