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Preliminary Procedure

  1. Verify customers complaint by operating power windows. Check window alignment, window mounting, window frame interference or damaged switches. Check for blown fuse(s), loose or corroded connectors, or damaged wiring harness. Repair or replace components as necessary.
  2. If all components are okay, connect NGS tester to DLC located below instrument panel. Using NGS tester, perform DATA LINK DIAGNOSTIC TEST. If NGS tester displays CKT 914, CKT 915 or CKT 70=ALL ECUS NO RESP/NOT EQUIP, see MODULE COMMUNICATIONS NETWORK article to diagnosis network concern. If NGS tester displays NO RESP/NOT EQUIP for Generic Electronic Module (GEM), go to TEST E: NO COMMUNICATION WITH GEM  under SYSTEM TESTING.
  3. If NGS tester displays SYSTEM PASSED for GEM, retrieve and record continuous DTCs using NGS tester. Erase continuous DTCs. Perform GEM/CTM self-test diagnostics using NGS tester. If GEM/CTM DTCs B1302, B1304, B1313 or B1315 are retrieved, go to TEST A: ALL POWER WINDOWS ARE INOPERATIVE  under SYSTEM TESTING. If GEM/CTM DTCs B1398, B1400, B1404, B1405, B1410 or B1475 are retrieved, perform appropriate test under SYSTEM TESTING. If any other GEM/CTM DTC is retrieved, see GENERIC ELECTRONIC MODULE/CENTRAL TIMER MODULE (GEM/CTM) DTC DEFINITIONS table to continue diagnosis. If no DTCs are retrieved, perform appropriate test under SYSTEM TESTING .
GENERIC ELECTRONIC MODULE/CENTRAL TIMER MODULE (GEM/CTM) DTC DEFINITIONS

DTC Source Module Description
B1302 GEM (1) Accessory Delay Relay Coil Ckt Failure
B1304 GEM (1) Accessory Delay Relay Coil Ckt Short To Battery
B1313 GEM/CTM (1) Battery Saver Relay Coil Ckt Failure
B1315 GEM/CTM (1) Battery Saver Relay Coil Ckt Short To Battery
B1317 GEM/CTM (2)(3) Battery Voltage High
B1318 GEM/CTM (2)(3) Battery Voltage Low
B1322 GEM/CTM (4)(3) Driver Door Ajar Ckt Short To Ground
B1323 GEM/CTM (5) Driver Door Ajar Light Ckt Failure
B1325 GEM/CTM (5) Door Ajar Light Ckt Short To Battery
B1330 GEM/CTM (4)(3)Passenger Door Ajar Ckt Short To Ground
B1340 GEM/CTM (6) Chime Input Request Ckt Short To Ground
B1342 GEM/CTM (7) GEM/CTM Is Defective
B1352 GEM/CTM (6)(3) Ignition Key-In Ckt Failure
B1355 GEM/CTM (8) Ignition RUN Ckt Failure
B1359 GEM/CTM (8) Ignition RUN/ACC Ckt Failure
B1371 GEM (4) Illuminated Entry Relay Ckt Failure
B1373 GEM (4) Illuminated Entry Relay Short To Battery
B1398 GEM (9)Driver Door 1-Touch Window Relay Ckt Failure
B1400 GEM (9)Driver Door 1-Touch Window Relay Coil Ckt Short To Battery
B1404 GEM (9)Driver Door Window Down Switch Input Ckt Open
B1405 GEM . (9)Driver Door Window Down Switch Input Ckt Short To Battery B1410
GEM (9)(3) Driver Door Window Motor Ckt Failure B1426
GEM/CTM (5) Seat Belt Light Ckt Short To Battery B1428
GEM/CTM (5) Seat Belt Light Ckt Failure B1431
GEM/CTM (10) Wiper Brake/Run Relay Ckt Failure B1432
GEM/CTM (10)Wiper Brake/Run Relay Ckt Short To Battery B1434
GEM/CTM (10) Wiper High/Low Speed Relay Ckt Failure B1436
GEM/CTM (10) Wiper High/Low Speed Relay Ckt Short To Battery B1438
GEM/CTM (10)(3) Wiper Mode Select Switch Ckt Failure B1441
GEM/CTM (10)(3) Wiper Mode Select Switch Short To Ground B1446
GEM/CTM (10)(3) Wiper Park Sense Ckt Failure B1450
GEM/CTM (10)(3)Wiper/Wash Interval Delay Switch Input Failure B1453
GEM/CTM (10)(3) Wiper/Wash Interval Delay Switch Input Short To Ground B1458
GEM/CTM (10) Wiper/Washer Pump Motor Relay Ckt Failure B1460
GEM/CTM (10) Wiper/Washer Pump Motor Relay Coil Short To Battery B1462
GEM/CTM (6)(3) Seat Belt Switch Ckt Failure B1463
GEM/CTM (6)(3) Seat Belt Switch Ckt Open B1466
GEM/CTM (10) Wiper High/Low Speed Not Switching B1467
GEM/CTM (10) Wiper Motor Hi/Low Speed Ckt Short To Battery B1473
GEM/CTM (10) Wiper Motor Low Speed Ckt Failure B1475
GEM (9) Delayed Accessory Relay Contacts Short To Battery B1476
GEM/CTM (10) Wiper Motor High Speed Ckt Failure B1483
GEM (11) Brake Pedal Input Ckt Failure B1485
GEM (11) Brake Pedal Input Ckt Short To Battery B1577
GEM/CTM (12)(3) Parking Light Input Ckt Short To Battery B1610
GEM (4)(3) Illuminated Entry Input Ckt Short To Ground B1833
GEM (13) Door Unlock Switch Ckt Short To Ground B1834
GEM (13) Door Unlock Disarm Output Ckt Failure B1836
GEM (13) Door Unlock Disarm Output Ckt Short To Battery B1840
GEM/CTM (10) Wiper Power Ckt Failure B2141
GEM (14) NVM Configuration Failure C1751
GEM/CTM (5) VSS Output Short To Battery C1752
GEM/CTM (5) VSS Output Short To Ground P0500
GEM (11) Vehicle Speed Signal Ckt Failure P1804
GEM (11) 4WD High Indicator Ckt Failure P1806
GEM (11) 4WD High Indicator Ckt Short To Battery P1808
GEM (11) 4WD Low Indicator Ckt Failure P1810
GEM (11) 4WD Low Indicator Ckt Short To Battery P1812
GEM (11) 4WD Mode Select Switch Ckt Failure P1815
GEM (11) 4WD Mode Select Switch Ckt Short To Ground P1820
GEM (11) Transfer Case Clockwise Shift Relay Coil Ckt Failure P1822
GEM (11) Transfer Case Clockwise Shift Relay Coil Short To Battery P1824
GEM (11) 4WD Electric Clutch Relay Ckt Failure P1826
GEM (11) 4WD Low Clutch Relay Ckt Short To Battery P1828
GEM (11) Transfer Case Counterclockwise Shift Relay Coil Ckt Failure P1830
GEM (11) Transfer Case Counterclockwise Shift Relay Coil Short To Battery P1832
GEM (11)Transfer Case Differential Lock-Up Solenoid Ckt Failure P1833
GEM (11)Transfer Case Differential Lock-Up Solenoid Open Ckt P1834
GEM (11)Transfer Case Differential Lock-Up Solenoid Short To Battery P1835
GEM (11)Transfer Case Differential Lock-Up Solenoid Short To Ground P1838
GEM (11) Transfer Case Shift Motor Ckt Failure P1846
GEM (11) Transfer Case Contact Plate "A" Ckt Failure P1850
GEM (11) Transfer Case Contact Plate "B" Ckt Failure P1854
GEM (11) Transfer Case Contact Plate "C" Ckt Failure P1858
GEM (11) Transfer Case Contact Plate "D" Ckt Failure P1863
GEM (11) Transfer Case Contact Plate Power Ckt Open P1866
GEM (11) Transfer Case System Concern P1867
GEM (11) Transfer Case Contact Plate General Ckt Failure P1875
GEM (11) Automatic Hall Effect Sensor Power Ckt Short To Power P1878
GEM (11)Transfer Case Disengage Solenoid Ckt Failure P1879
GEM (11) Transfer Case Disengage Solenoid Open Ckt P1880
GEM (11) Transfer Case Disengage Solenoid Short To Battery P1885
GEM (11) Transfer Case Disengage Solenoid Short To Ground P1891
GEM (11) Transfer Case Contact Plate Ground Return Ckt Open N/A
(1) Perform TEST A: ALL POWER WINDOWS ARE INOPERATIVE  under SYSTEM TESTS.
(2) See GENERATORS article in the STARTING & CHARGING SYSTEMS section for testing procedures.
(3) This DTC may also be present from GEM/CTM wiggle test.
(4) Test wiring for opens and/or shorts and repair as necessary. See appropriate wiring diagram in ILLUMINATION/INTERIOR LIGHTS article.
(5) See INSTRUMENT PANELS - ANALOG article for testing procedures.
(6) Test wiring for opens and/or shorts and repair as necessary. See appropriate wiring diagram in WARNING SYSTEMS article.
(7) Using NGS tester, clear DTCs. Retrieve DTCs. If DTC B1342 is retrieved, replace GEM/CTM and retest system operation.
(8) See STEERING COLUMN SWITCHES article for testing procedures.
(9) Perform appropriate test under SYSTEM TESTING .
(10) See WIPER/WASHER SYSTEMS article for testing procedures.
(11) See TRANSFER CASES article in the TRANSMISSIONS section for testing procedures.
(12) Test wiring for opens and/or shorts and repair as necessary. See appropriate wiring diagram in EXTERIOR LIGHTS article.
(13) See REMOTE KEYLESS ENTRY SYSTEMS article for testing procedures.
(14) Vehicle speed calibration data is not programmed into GEM/CTM. Use NGS tester configuration card help screen to program tire size and axle ratio. Retest system operation. If DTC B2141 is still present, replace GEM/CTM and retest system operation.
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