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Did you hook up a professional grade scan tool an check for DTC'S diagnostic trouble codes in the GEM module ?
GO to Pinpoint Test H .
B1840
Wiper Front Power Circuit Failure
GEM
GO to Pinpoint Test A .
B1431
Wiper Brake/Run Relay Circuit Failure
GEM
GO to Pinpoint Test A .
B1432
Wiper Brake/Run Relay Circuit Short to Battery
GEM
GO to Pinpoint Test A .
B1434
Wiper Hi/Low Speed Relay Coil Circuit Failure
GEM
GO to Pinpoint Test C .
B1436
Wiper Hi/Low Speed Relay Coil Circuit Short to Battery
GEM
GO to Pinpoint Test C .
B1438
Wiper Mode Select Switch Circuit Failure
GEM
GO to Pinpoint Test A .
B1441
Wiper Mode Select Switch Circuit Short to Ground
GEM
GO to Pinpoint Test A .
B1446
Wiper Park Sense Circuit Failure
GEM
GO to Pinpoint Test D .
B1450
Wiper Wash/Delay Switch Circuit Failure
GEM
GO to Pinpoint Test A .
B1453
Wiper Wash/Delay Switch Circuit Short to Ground
GEM
GO to Pinpoint Test A .
B1466
Wiper Hi/Low Speed Not Switching
GEM
GO to Pinpoint Test C .
B1473
Wiper Low Speed Circuit Motor Failure
GEM
GO to Pinpoint Test C .
B1476
Wiper High Speed Circuit Motor Failure
GEM
GO to Pinpoint Test C .
Wouldn't think fuse being the problem , fuse's don't go bad and don't blow for no reason . If the fuse was or is blown you would have bigger problems , electrical short . The wire or circuit's that fuse protects are battery positive voltage ,if the wire has been rubbed through an touching any metal on the vehicle this would blow the fuse. Your 4 wheel drive is controlled by a four wheel drive control module (computer) , Has four different fuse's that supply Battery voltage to it. The 4X4 system is able to set code's in the 4X4 control module , your best bet ,take it to a qualified repair shop. These 4X4 systems can set a bunch of different code's
P1804
4WD High Indicator Circuit Failure
GEM
GO to Pinpoint Test C .
P1806
4WD High Indicator Short to Battery
GEM
GO to Pinpoint Test C .
P1808
4WD Low Indicator Circuit Failure
GEM
GO to Pinpoint Test C .
P1810
4WD Low Indicator Short Circuit to Battery
GEM
GO to Pinpoint Test C .
P1812
4WD Mode Select Circuit Failure
GEM
GO to Symptom Chart.
P1815
4WD Mode Select Short Circuit to Ground
GEM
GO to Symptom Chart.
P1820
Transfer Case CW Shift Relay Coil Circuit Open or Short to Ground
GEM
GO to Pinpoint Test B .
P1822
Transfer Case CW Shift Relay Coil Short to Battery
GEM
GO to Pinpoint Test B .
P1824
4WD Electric Clutch Relay Circuit Failure
GEM
GO to Pinpoint Test A .
P1826
4WD Electric Clutch Relay Short to Battery
GEM
GO to Pinpoint Test A .
P1828
Transfer Case CCW Shift Relay Circuit Failure
GEM
GO to Pinpoint Test B .
P1830
Transfer Case CCW Shift Relay Coil Short to Battery
GEM
GO to Pinpoint Test B .
P1836
Transfer Case Front Shaft Speed Sensor Circuit Failure
GEM
GO to Symptom Chart.
P1837
Transfer Case Rear Shaft Speed Sensor Circuit Failure
GEM
GO to Symptom Chart.
P1838
Transfer Case Shift Motor Circuit Failure
GEM
GO to Pinpoint Test B .
P1846
Transfer Case CONTACT PLATE "A" Circuit Failure
GEM
GO to Pinpoint Test B .
P1850
Transfer Case CONTACT PLATE "B" Circuit Failure
GEM
GO to Pinpoint Test B .
P1854
Transfer Case CONTACT PLATE "C" Circuit Failure (GEM Only)
GEM
GO to Pinpoint Test B .
P1858
Transfer Case CONTACT PLATE "D" Circuit Failure (GEM Only)
GEM
GO to Pinpoint Test B .
P1866
Transfer Case Maintenance Required (GEM Only) (4-wheel drive operation can be restored by clearing the DTC and cycling the ignition.)
GEM
GO to Pinpoint Test B .
P1867
Transfer Case Contact Plate General Circuit Failure (GEM Only)
GEM
GO to Pinpoint Test B .
P1874
Automatic Hall Effect Sensor Power Circuit Failure
GEM
GO to Symptom Chart.
P1875
Automatic Hall Effect Sensor Power Circuit Short to Battery (GEM Only)
GEM
GO to Symptom Chart.
P1891
Transfer Case Contact Plate Ground Return Open Circuit
GEM
GO to Pinpoint Test B .
What seam's to be the problem ? Would hate for you to replace the switch an have it not fix the problem .
The wiper's not working ? There is a whole list of thing's that could be the problem . Same for the dash light's ?
Symptom Chart
Condition
Possible Sources
Action
The wipers are inoperative
Central junction box (CJB) fuse:
16 (30A)
Circuitry.
GEM.
Multifunction switch.
Wiper run/park relay.
Wiper HI/LO relay.
Wiper motor.
GO to Pinpoint Test A .
Hooking up a scan tool an checking for DTC'S - diagnostic trouble code's in the GEM module . GEM Diagnostic Trouble Code (DTC) Index
GEM Diagnostic Trouble Code (DTC) Index
DTC
Description
DTC Caused By
Action
B1431
Wiper Brake/Run Relay Circuit Failure
GEM
GO to Pinpoint Test A .
B1432
Wiper Brake/Run Relay Circuit Short to Battery
GEM
GO to Pinpoint Test A .
B1434
Wiper Hi/Lo Speed Relay Failure
GEM
GO to the Symptom Chart.
B1436
Wiper Hi/Lo Speed Relay Coil Circuit Short to Battery
GEM
GO to Pinpoint Test C .
B1438
Wiper Mode Select Switch Circuit Failure
GEM
GO to the Symptom Chart.
B1441
Wiper Mode Select Switch Circuit Short to Ground
GEM
GO to the Symptom Chart.
B1446
Wiper Park Sense Circuit Failure
GEM
GO to Pinpoint Test D .
B1450
Wiper Wash/Delay Switch Circuit Failure
GEM
GO to the Symptom Chart.
B1453
Wiper Wash/Delay Switch Circuit Short to Ground
GEM
GO to the Symptom Chart.
B1458
Wiper/Washer Pump Motor Relay Circuit Failure
GEM
GO to Pinpoint Test E .
B1460
Wiper/Washer Pump Motor Relay Circuit Short to Battery
GEM
GO to Pinpoint Test E .
B1466
Wiper Hi/Low Speed Not Switching
GEM
GO to Pinpoint Test C .
B1467
Wiper Hi/Low Speed Circuit Motor Short to Battery
GEM
GO to the Symptom Chart.
B1473
Wiper Low Speed Circuit Motor Failure
GEM
GO to the Symptom Chart.
B1476
Wiper High Speed Circuit Motor Failure
GEM
GO to the Symptom Chart.
B1840
Wiper Front Power Circuit Failure Open/Short to Ground
GEM
GO to Pinpoint Test A .
-
All Other DTCs
GEM
REFER to Section 419-10.
The multifunction switch has nothing to do with the dash light's
Instrument Cluster and Panel Illumination
The instrument cluster and panel lighting system is powered through the headlamp switch and the panel dimmer switch. The instrument cluster illumination is controlled by the output of the panel dimmer switch. The instrument panel lighting circuit provides illumination for the:
To find out what is draining the battery do a parasitic draw test . How To Perform Parasitic Draw Test EricTheCarGuy Test to be sure , before replacing GEM module .I would also have the GEM checked for DTC'S - diagnostic trouble codes . I would also check the battery saver relay .
SECTION 417-02: Interior Lighting
2000 Explorer/Mountaineer Workshop Manual
DESCRIPTION AND OPERATION
Procedure revision date: 06/17/1999
Interior Lighting
The interior lighting system consists of the following:
dome/map lamp
rear dome/cargo lamp
overhead console/map lamp
RH/LH vanity mirror
ash receptacle lamp
puddle lamps
interior lamp switches
interior lamp relay
dimmer module
battery saver relay
generic electronic module (GEM)
Generic Electronic Module (GEM)/Central Timer Module (CTM) Controlled Functions
The generic electronic module (GEM) is equipped on four-wheel drive vehicles with power windows. The central timer module (CTM) is equipped only on two-wheel drive vehicles without power windows.
NOTE: GEM/CTM diagnostics are compatible with the scan tool.
The GEM/CTM incorporates the functions of several different modules into one, and offers diagnostics to easily locate and repair concerns affecting the subsystems that it controls.
The GEM/CTM constantly monitors the systems it controls and reports a concern in the form of a diagnostic trouble code (DTC). A DTC can be retrieved with the scan tool through the communication link.
The scan tool is a menu-driven tester that allows the user to run specific tests. The scan tool can isolate faults in the GEM/CTM subsystems through a symptom-driven diagnostic procedure. Connecting the scan tool to the GEM/CTM communication link will not alert the GEM/CTM. If the GEM/CTM is "asleep" when the diagnostic connector is plugged in, the GEM/CTM must be "awakened". If the communication link cannot be established, turn the ignition to RUN.
NOTE: The GEM/CTM has a sleep function to minimize battery consumption. During the sleep mode, the GEM/CTM turns off all outputs and monitors only the following:
door ajar (driver door, passenger door, liftgate, LH rear and RH rear doors).
If a change of status occurs at one of these inputs while the GEM/CTM is "asleep", the GEM/CTM will "wake up." When the GEM/CTM awakens, it carries out an internal self-test, and begins normal operation. At this point, the GEM/CTM will have all of its functions operational.
The GEM/CTM will go into the sleep mode immediately after both of the following conditions have been met:
key in OFF or key not in ignition.
after 45 minutes with no change in any wake-up input.
The GEM/CTM control system has two modes of operation; the normal operating mode and the tester-dependent diagnostics mode.
Normal operation of the GEM/CTM can detect errors. An integral part of normal GEM/CTM operation is continuous diagnostic capability. Continuous diagnostics detects errors and changes the GEM/CTM control strategy. There is no warning lamp for the GEM/CTM; therefore, a DTC concern will direct you to the GEM/CTM. Examples of faults that may be detected during normal operation include:
NOTE: The GEM/CTM can only detect open circuit/short to GRD faults when the GEM/CTM is not energizing a load, and short to battery faults when the GEM/CTM is attempting to energize a load.
No smart junction box , GEM - generic electronic module ! this module energizes the relays in the battery junction box ! The gem module is behind the center of the dash !
Generic Electronic Module (GEM)
Removal and Installation
> CAUTION: Prior to removal of the generic electronic module (GEM), it is necessary to upload module configuration information to the diagnostic tool. This information needs to be downloaded into the new module once installed. For additional information, refer to Section 418-01 .
Depower the supplemental restraint system (SRS). For additional information, refer to Section 501-20B .
Remove the radio chassis. For additional information, refer to Section 415-01 .
Remove the center instrument panel finish panel.
Remove the screws.
Remove the center instrument panel finish panel.
Disconnect electrical connectors.
Module Controlled Functions
The multifunction modules consist of the following:
generic electronic module (GEM)
central security module
The GEM controls the following features:
front wiper and washer
warning chime
battery saver
illuminated entry and interior lighting
driver one-touch down power window (optional)
battery saver relay
door ajar warning indicator lamp
safety belt warning indicator lamp
The central security module controls the following features:
remote keyless entry
computer-operated lock system
trim switch unlock inhibit
It's more then likely to have DTC'S diagnostic trouble codes stored in it's memory !
B1431
Wiper Brake/Run Relay Circuit Failure
GEM
REFER to Section 501-16 .
B1432
Wiper Brake/Run Relay Circuit Short to Battery
GEM
REFER to Section 501-16 .
B1434
Wiper Hi/Low Speed Relay Circuit Failure
GEM
REFER to Section 501-16 .
B1436
Wiper Hi/Low Speed Relay Circuit Short to Battery
GEM
REFER to Section 501-16 .
B1438
Wiper Mode Select Switch Circuit Failure
GEM
REFER to Section 501-16 .
B1441
Wiper Mode Select Switch Circuit Short to Ground
GEM
REFER to Section 501-16 .
B1446
Wiper Park Sense Circuit Failure
GEM
REFER to Section 501-16 .
B1450
Wiper Wash/Delay Switch Circuit Failure
GEM
REFER to Section 501-16 .
B1453
Wiper Wash/Delay Switch Circuit Short to Ground
GEM
REFER to Section 501-16 .
B1458
Wiper Washer Pump Motor Relay Circuit Failure
GEM
REFER to Section 501-16 .
B1460
Wiper Washer Pump Motor Relay Circuit Short to Battery
GEM
REFER to Section 501-16 .
B1462
Safety Belt Switch Circuit Failure
GEM
REFER to Section 413-09 .
B1466
Wiper Hi/Low Speed Not Switching
GEM
REFER to Section 501-16 .
B1473
Wiper Low Speed Circuit Motor Failure
GEM
REFER to Section 501-16 .
B1476
Wiper High Speed Circuit Motor Failure
GEM
REFER to Section 501-16
Your wipers do not work at all ? did you check this fuse Central Junction Box (CJB) fuse 16 (30A)
The wipers are inoperative
Central junction box (CJB) fuse:
16 (30A)
Circuitry.
GEM.
Multifunction switch.
Wiper run/park relay.
Wiper HI/LO relay.
Wiper motor.
GO to Pinpoint Test A .
Before replacing parts you need to test , check for codes !
The electronic module (located behind the glove compartment) controls the operation of the transfer case in response to inputs from the electric shift motor, 4x4 mode switch, CPP switch, BPP switch, DTR sensor, throttle position output from the PCM, front and rear OSS sensors, and the VSS. Do you know what DTC'S Are ? Diagnostic trouble codes !
P1804
4WD High Indicator Circuit Failure
GEM
GO to Pinpoint Test C .
P1806
4WD High Indicator Short to Battery
GEM
GO to Pinpoint Test C .
P1808
4WD Low Indicator Circuit Failure
GEM
GO to Pinpoint Test C .
P1810
4WD Low Indicator Short Circuit to Battery
GEM
GO to Pinpoint Test C .
P1812
4WD Mode Select Circuit Failure
GEM
GO to Symptom Chart.
P1815
4WD Mode Select Short Circuit to Ground
GEM
GO to Symptom Chart.
P1820
Transfer Case CW Shift Relay Coil Circuit Open or Short to Ground
GEM
GO to Pinpoint Test B .
P1822
Transfer Case CW Shift Relay Coil Short to Battery
GEM
GO to Pinpoint Test B .
P1824
4WD Electric Clutch Relay Circuit Failure
GEM
GO to Pinpoint Test A .
P1826
4WD Electric Clutch Relay Short to Battery
GEM
GO to Pinpoint Test A .
P1828
Transfer Case CCW Shift Relay Circuit Failure
GEM
GO to Pinpoint Test B .
P1830
Transfer Case CCW Shift Relay Coil Short to Battery
GEM
GO to Pinpoint Test B .
P1836
Transfer Case Front Shaft Speed Sensor Circuit Failure
GEM
GO to Symptom Chart.
P1837
Transfer Case Rear Shaft Speed Sensor Circuit Failure
GEM
GO to Symptom Chart.
P1838
Transfer Case Shift Motor Circuit Failure
GEM
GO to Pinpoint Test B .
P1846
Transfer Case CONTACT PLATE "A" Circuit Failure
GEM
GO to Pinpoint Test B .
P1850
Transfer Case CONTACT PLATE "B" Circuit Failure
GEM
GO to Pinpoint Test B .
P1854
Transfer Case CONTACT PLATE "C" Circuit Failure (GEM Only)
GEM
GO to Pinpoint Test B .
P1858
Transfer Case CONTACT PLATE "D" Circuit Failure (GEM Only)
GEM
GO to Pinpoint Test B .
P1866
Transfer Case Maintenance Required (GEM Only) (4-wheel drive operation can be restored by clearing the DTC and cycling the ignition.)
GEM
GO to Pinpoint Test B .
P1867
Transfer Case Contact Plate General Circuit Failure (GEM Only)
GEM
GO to Pinpoint Test B .
P1874
Automatic Hall Effect Sensor Power Circuit Failure
GEM
GO to Symptom Chart.
P1875
Automatic Hall Effect Sensor Power Circuit Short to Battery (GEM Only)
GEM
GO to Symptom Chart.
P1891
Transfer Case Contact Plate Ground Return Open Circuit
GEM
GO to Pinpoint Test B
Your best bet , take it to a qualified repair shop
The 4X4 system on your vehicle is computer controlled , GEM module . generic electronic module . The four wheel drive mode switch is a low voltage input to the GEM module . The GEM energizes relay's to control the mode as depicted by input from the mode switch an torque on demand relay an someother inputs . Probably has DTC - diagnostic trouble codes stored in the GEM module .
Transfer Case -Automatic Four-Wheel Drive (A4WD)
The automatic 4-wheel drive transfer case system consists of the following:
automatic 4WD indicator light
brake pedal position (BPP) switch
torque on demand (TOD) relay
front output shaft speed sensor
generic electronic module (GEM)
4WD high indicator light
4WD low indicator light
4WD mode switch
rear output shaft speed sensor
shift position sensor
throttle position output (TPO) from the powertrain control module (PCM)
transmission range sensor
P1804
Transmission 4-Wheel Drive High Indicator Circuit Failure
GEM
REFER to Section 413-01 .
P1806
Transmission 4-Wheel Drive High Indicator Short Circuit to Battery
GEM
REFER to Section 413-01 .
P1812
Transmission 4-Wheel Drive Mode Select Circuit Failure
GEM
REFER to the Symptom Chart.
P1815
Transmission 4-Wheel Drive Mode Select Short Circuit to Ground
GEM
GO to Pinpoint Test C .
P1820
Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure
GEM
GO to Pinpoint Test B .
P1822
Transmission Transfer Case Clockwise Shift Relay Coil Short Circuit to Battery
GEM
GO to Pinpoint Test B .
P1824
Transmission 4-Wheel Drive Clutch Relay Circuit Failure
GEM
GO to Pinpoint Test A .
P1826
Transmission 4-Wheel Drive Low Clutch Relay Circuit to Battery
GEM
GO to Pinpoint Test A .
P1828
Transmission Transfer Case Counter Clockwise Shift Relay Coil Circuit Failure
GEM
GO to Pinpoint Test B .
P1830
Transmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit to Battery
GEM
GO to Pinpoint Test B .
P1836
Transmission Transfer Case Front Shaft Speed Sensor Circuit Failure
GEM
GO to Pinpoint Test A .
P1837
Transmission Transfer Case Rear Shaft Speed Sensor Circuit Failure
GEM
GO to Pinpoint Test A .
P1838
Transmission Transfer Case Shift Motor Circuit Failure
GEM
REFER to the Symptom Chart.
P1846
Transmission Transfer Case Contact Plate 'A' Circuit Failure
GEM
REFER to the Symptom Chart.
P1850
Transmission Transfer Case Contact Plate 'B' Circuit Failure
GEM
REFER to the Symptom Chart.
P1854
Transmission Transfer Case Contact Plate 'C' Circuit Failure
GEM
REFER to the Symptom Chart.
P1858
Transmission Transfer Case Contact Plate 'D' Circuit Failure
GEM
REFER to the Symptom Chart.
P1866
Transmission Transfer Case System Concern - Servicing Required
GEM
REFER to the Symptom Chart.
P1867
Transmission Transfer Case Contact Plate General Circuit Failure
GEM
REFER to the Symptom Chart.
P1874
Transmission Automatic Hall Effect Sensor Power Circuit Failure
GEM
GO to Pinpoint Test A .
P1875
Transmission Automatic Hall Effect Sensor Power Circuit Short to Battery
GEM
REFER to the Symptom Chart.
P1891
Transmission Transfer Case Contact Plate Ground Return Open Circuit
GEM
REFER to the Symptom Chart.
P1892
Trans. Automatic 4-Wheel Drive 4X4 Mechanical Lock Output Circuit Failure
GEM
GO to Pinpoint Test B .
P1893
Trans. Auto. 4-Wheel Drive 4X4 Mechanical Lock Output Short to Battery
GEM
GO to Pinpoint Test B .
Your best bet , take it to a qualified repair shop .
Are u assuming the GEM module is at fault ? Did you or your local auto electrician check for DTC'S - diagnostic trouble codes?
GEM/CTM Wiggle Test Diagnostic Trouble Code (DTC) Index
DTC
Description
DTC Caused By
B1317
Battery Voltage HIGH
GEM/CTM
B1318
Battery Voltage Low
GEM/CTM
B1322
Driver Door Ajar Circuit Short to Ground
GEM/CTM
B1330
Passenger Door Ajar Short to Ground
GEM/CTM
B1352
Ignition Key-In Circuit Failure
GEM/CTM
B1410
Driver Power Window Motor Circuit Failure
GEM
B1438
Wiper Mode Select Switch Circuit Failure
GEM/CTM
B1441
Wiper Mode Select Switch Short to Ground
GEM/CTM
B1446
Wiper Park Sense Circuit Failure
GEM/CTM
B1450
Wiper/Wash Interval Delay Switch Input Circuit Failure
GEM/CTM
B1453
Wiper/Wash Interval Delay Switch Input Short to Ground
GEM/CTM
B1462
Seat Belt Switch Circuit Failure
GEM/CTM
B1577
Park Lamp Input Circuit Short to Battery
GEM/CTM
B1610
Illuminated Entry Input (From RAP Module) Circuit Short to Ground
GEM/CTM
Did you an your auto electrican check power an grounds for the GEM ? Voltage drop testing ? . Did you check power an ground circuits for the affected systems . Working when they want sounds more like a loose connection somewhere . ECM Inputs and Outputs Diagnosis Symptom Chart
Symptom Chart
Condition
Possible Sources
Action
The Wipers Are Inoperative
CJB Fuse 16 (30A).
Circuitry.
GEM/CTM.
Multi-function switch (13K359).
Wiper run/park relay.
Wiper HI/LO relay.
Wiper motor.
DTC B1431.
DTC B1432.
DTC B1438.
DTC B1450.
DTC B1840.
GO to Pinpoint Test A .
Plus looking at GEM scan data on a factory scan tool .Too many people miss diagnose these system's because they don't have a clue .
I would suspect you have a bad door switch on one of the doors or liftgate. They are usually plunger switches. Try pusing them in one at a time and see f the lights go out. Hold it in long enough to account for the time delay.
please rate if this helps you.
---------
The Courtesy Lamps Stay On Continuously
Circuitry.
GEM/CTM.
Ignition switch.
Interior lamp relay.
Dimmer module.
Door ajar switch.
DTC B1322.
DTC B1330.
DTC B1334.
DTC B1338.
DTC B1371.
DTC B1574.
DTC B1610.
------------------------------------ Generic Electronic Module (GEM)/Central Timer Module (CTM) Controlled Functions
The generic electronic module (GEM) is equipped on four-wheel drive vehicles with power windows. The central timer module (CTM) is equipped only on two-wheel drive vehicles without power windows. NOTE: GEM/CTM diagnostics are compatible with New Generation STAR (NGS) Tester.
The GEM/CTM incorporates the functions of several different modules into one, and offers diagnostics to easily locate and repair concerns affecting the subsystems that it controls.
The GEM/CTM constantly monitors the systems under its control and reports a concern in the form of a diagnostic trouble code (DTC). A DTC can be retrieved with NGS Tester through the communication link.
NGS Tester is a menu-driven tester that allows the user to run specific tests. NGS Tester can isolate faults in the GEM/CTM subsystems through a symptom-driven diagnostic procedure. Connecting NGS Tester to the GEM/CTM communication link will not alert the GEM/CTM. If the GEM/CTM is "asleep" when the diagnostic connector is plugged in, the GEM/CTM must be "awakened". If the communication link cannot be established, it is advised to turn the ignition to RUN. NOTE: The GEM/CTM has a sleep function to minimize battery consumption. During the sleep mode, the GEM/CTM turns off all outputs and monitors only the following:
Door ajar (driver door, passenger door, liftgate, LH rear and RH rear doors).
If a change of status occurs at one of these inputs while the GEM/CTM is asleep, the GEM/CTM will "wake up." When the GEM/CTM awakens, it performs an internal self-test, and begins normal operation. At this point, the GEM/CTM will have all of its functions operational.
The GEM/CTM will go into the sleep mode immediately after both of the following conditions have been met:
Key in OFF or key not in ignition.
After 45 minutes with no change in any wake-up input.
The GEM/CTM control system has two modes of operation; the normal operating mode and the tester-dependent diagnostics mode.
The normal operation of the GEM/CTM can detect errors. An integral part of the normal GEM/CTM operation is the continuous diagnostic capability. Continuous diagnostics detects errors and changes the GEM/CTM control strategy. There is no warning lamp for the GEM/CTM; therefore, a DTC concern will direct you to the GEM/CTM. Examples of faults that may be detected during normal operation include: NOTE: The GEM/CTM can only detect open circuit/short to GRD faults when the GEM/CTM in not energizing a load, and short to battery faults when the GEM/CTM is attempting to energize a load.
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