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defined as the amount of time from the start of a
wipe to the beginning of the next wipe. The rear
wiper system delay time is based on the following:
7.75 - (MPH x .05) = Seconds delay
Examples:
At zero (0) MPH the delay is 7.75 seconds.
At 100 MPH the delay is 2.75 seconds.
3.21.8 WIPE AFTER WASH
When the driver presses the wash button for over
1.5 seconds and releases it, the wiper will continue
to run for 2 additional wipe cycles.
3.22 USING THE DRBIIIT
Refer to the DRBIIItuser guide for instructions
and assistance with reading trouble codes, erasing
trouble codes, and other DRBIIItfunctions.
3.22.1 DRBIIITERROR MESSAGES
Under normal operation, the DRBIIItwill dis-
play one of only two error messages: user-requested
WARM Boot or User-Requested COLD Boot. If the
DRBIIItshould display any other error message,
record the entire display and call the STAR Center.
This is a sample of such an error message display:
ver:2.14
date: 26 Jul93
file: key_iff.cc
date: Jul26 1993
line: 548
err: 0xi
User-Requested COLD Boot
Press MORE to switch between this display
and the application screen.
Press F4 when done noting information.
3.22.2 DRBIIITDOES NOT POWER UP
(BLANK SCREEN)
If the LED's do not light or no sound is emitted at
start up, check for loose cable connections or a bad
cable. Check the vehicle battery voltage (data link
connector cavity 16). A minimum of 11 volts is
required to adequately power the DRBIIIt. Check
for proper grounds at DLC cavities 4 and 5.
If all connections are proper between the
DRBIIItand the vehicle or other devices, and the
vehicle battery is fully charged, an inoperative
DRBIIItmay be the result or a faulty cable or
vehicle wiring.
3.22.3 DISPLAY IS NOT VISIBLE
Low temperatures will affect the visibility of the
display. Adjust the contrast to compensate for this
condition.
4.0 DISCLAIMERS, SAFETY,
WARNINGS
4.1 DISCLAIMERS
All information, illustrations, and specifications
contained in this manual are based on the latest
information available at the time of publication.
The right is reserved to make changes at any time
without notice.
4.2 SAFETY
4.2.1 TECHNICIAN SAFETY INFORMATION
WARNING: ENGINES PRODUCE CARBON
MONOXIDE THAT IS ODORLESS, CAUSES
SLOWER REACTION TIME, AND CAN LEAD
TO SERIOUS INJURY. WHEN THE ENGINE IS
OPERATING, KEEP SERVICE AREAS WELL
VENTILATED OR ATTACH THE VEHICLE
EXHAUST SYSTEM TO THE SHOP EXHAUST
REMOVAL SYSTEM.
Set the parking brake and block the wheel before
testing or repairing the vehicle. It is especially
important to block the wheels on front-wheel drive
vehicles; the parking brake does not hold drive
wheels.
When servicing a vehicle, always wear eye pro-
tection, and remove any metal jewelry such as
rings, watchbands or bracelets that might make an
inadvertent electrical contact.
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GENERAL INFORMATION
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When diagnosing a chassis system problem, it is
important to follow approved procedures where
applicable. These procedures can be found in this
General Information Section or in the service man-
ual procedures. Following these procedures is very
important to safety of individuals performing diag-
nostic tests.
4.2.2 VEHICLE PREPARATION FOR
TESTING
Make sure the vehicle being tested has a fully
charged battery. If it does not, false diagnostic codes
or error messages may occur.
4.2.3 SERVICING SUB-ASSEMBLIES
Some components of the chassis system are in-
tended to be serviced as an assembly only. Attempt-
ing to remove or repair certain system sub-
components may result in personal injury and/or
improper system operation. Only those components
with approved repair and installation procedures in
the service manual should be serviced.
4.2.4 DRBIIITSAFETY INFORMATION
WARNING: EXCEEDING THE LIMITS OF THE
DRBIIITMULTIMETER IS DANGEROUS. IT
CAN EXPOSE YOU TO SERIOUS OR
POSSIBLY FATAL INJURY. CAREFULLY
READ AND UNDERSTAND THE CAUTIONS
AND THE SPECIFICATION LIMITS.
²Follow the vehicle manufacturer 's service speci-
fications at all times.
²Do not use the DRBIIItif it has been damaged.
²Do not use the test leads if the insulation is
damaged or if metal is exposed.
²To avoid electrical shock, do not touch the test
leads, tips, or the circuit being tested.
²Choose the proper range and functions for the
measurement. Do not try voltage or current mea-
surement that may exceed the rated capacity.
²Do not exceed the limits shown in the table below:
FUNCTION INPUT LIMIT
Volts 0 - 500 peak volts AC
0 - 500 volts DC
Ohms (resistance)* 0 -1.12 megohms
Frequency Measured
Frequency Generated0-10kHz
Temperature -58 - 1100ÉF
-50 - 600ÉC* Ohms cannot be measured if voltage is present.
Ohms can be measured only in a non-powered
circuit.
²Voltage between any terminal and ground must
not exceed 500v DC or 500v peak AC.
²Use caution when measuring voltage above 25v
DC or 25v AC.
²Use the low current shunt to measure circuits up
to 10A. Use the high current clamp to measure
circuits exceeding 10A.
²When testing for the presence of voltage or cur-
rent, make sure the meter is functioning cor-
rectly. Take a reading of a known voltage or
current before accepting a zero reading.
²When measuring current, connect the meter in
series with the load.
²Disconnect the live test lead before disconnecting
the common test lead.
²When using the meter function, keep the
DRBIIItaway from spark plug or coil wires to
avoid measuring error from outside interference.
4.3 WARNINGS
4.3.1 VEHICLE DAMAGE WARNINGS
Before disconnecting any control module, make
sure the ignition is ªoffº. Failure to do so could
damage the module.
When testing voltage or continuity at any control
module, use the terminal side (not the wire end) of
the connector. Do not probe a wire through the
insulation; this will damage it and eventually cause
it to fail because of corrosion. Be careful when
performing electrical tests so as to prevent acciden-
tal shorting of terminals. Such mistakes can dam-
age fuses or components. Also, a second code could
be set, making diagnosis of the original problem
more difficult.
4.3.2 ROAD TESTING A COMPLAINT
VEHICLE
Some complaints will require a test drive as part
of the repair verification procedure. The purpose of
the test drive is to try to duplicate the diagnostic
code or symptom condition.
29
GENERAL INFORMATION
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WARNING: BEFORE ROAD TESTING A
VEHICLE, BE SURE THAT ALL
COMPONENTS ARE REASSEMBLED.
DURING THE TEST DRIVE, DO NOT TRY TO
READ THE DRBIIITSCREEN WHILE IN
MOTION. DO NOT HANG THE DRBIIITFROM
THE REAR VIEW MIRROR OR OPERATE IT
YOURSELF. HAVE AN ASSISTANT
AVAILABLE TO OPERATE THE DRBIIIT.
5.0 REQUIRED TOOLS AND
EQUIPMENT
DRBIIIt(diagnostic read-out box)
Jumper wires
Ohmmeter
Voltmeter
Sentry Key Tester
Test Light
8310 Airbag System Load Tool
8443 SRS Airbag System Load Tool
Diagnostic Junction Port Tester 8339
6.0 GLOSSARY OF TERMS
ABSantilock brake system
ACMairbag control module
AECMairbag electronic control module
(ACM)
ASDMairbag system diagnostic module
(ACM)
AT Cautomatic temperature control
BCMbody control module
CABcontroller antilock brake
CMTCcompass/mini-trip computer
CPAconnector positive assurance
DABdriver airbag
DCHAdiesel cabin heater assist
(cabin heater)
DLCdata link connector
DTCdiagnostic trouble code
DRdriver
EBLelectric back lite (rear window de-
fogger)ECMEngine control module
EVICelectronic vehicle information center
FCMfront control module
GCCGulf Coast Countries
HVACheater ventilation, air conditioning
IPMintelligent power module
LDUlower drive unit
LHDLeft Hand Drive
MICmechanical instrument cluster
MTCmanual temperature control
MSMMmemory seat/mirror module
OBDon board diagnostics
ODOodometer
ORCoccupant restraint controller
PA Bpassenger airbag
PASSpassenger
PCIProgrammable Communication In-
terface (vehicle communication bus)
PCMpowertrain control module
PDCpower distribution center
PLGpower liftgate
PLGMpower liftgate module
PSDpower sliding door
PSDMpower sliding door module
PWMpulse width modulated
RHDRight Hand Drive
RKEremote keyless entry
SABseat airbag
SBTseat belt tensioner
SIACMside impact airbag control module
SKIMsentry key immobilizer module
SKISsentry key immobilizer system
SQUIBalso called initiator (located inside
airbag)
SRSsupplemental restraint system
TCMtransmission control module
VFDvacuum fluorescent display
VTSSvehicle theft security system
30
GENERAL INFORMATION
Page 60 of 4284
7.0
DIAGNOSTIC INFORMATION AND
PROCEDURES
31
Page 61 of 4284

Symptom List:
FCM, ORC RUN ONLY DRIVER OPEN - ACTIVE
FCM, ORC RUN ONLY DRIVER OVER CURRENT - ACTIVE
FCM, ORC RUN ONLY DRIVER OVER TEMP - ACTIVE
FCM, ORC RUN ONLY DRIVER OVER VOLT - ACTIVE
FCM, ORC RUN ONLY DRIVER SHORT TO GROUND - ACTIVE
ORC, LOSS OF IGNITION RUN ONLY - ACTIVE
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be FCM, ORC RUN ONLY DRIVER
OPEN - ACTIVE.
When Monitored and Set Condition:
FCM, ORC RUN ONLY DRIVER OPEN - ACTIVE
When Monitored: When the ignition is turned OFF, the microprocessor controlled
transistor (high side driver) places a diagnostic voltage on the ORC Run-Start circuit for
60 seconds. An open high side driver (HSD) circuit voltage is between 2.4 and 5.0 volts.
Set Condition: This code will set within 10 second, if the microprocessor senses 2.4 to 5.0
volts on the HSD. Note: the diagnostic voltage will only last for 60 seconds after the
ignition is turned off.
FCM, ORC RUN ONLY DRIVER OVER CURRENT - ACTIVE
When Monitored: The FCM uses a microprocessor controlled transistor (high side driver)
to supply power to the ORC. The microprocessor monitors the high side driver (HSD)
internal temperature when the ignition is in the Run Only position.
Set Condition: The code will set within 1 second, if the microprocessor senses HSD
internal temperature. The high temperature is caused by over current.
FCM, ORC RUN ONLY DRIVER OVER TEMP - ACTIVE
When Monitored: The FCM uses a microprocessor controlled transistor (high side driver)
to supply power to the ORC. The microprocessor monitors the high side driver (HSD)
internal temperature when the ignition is in the Run position.
Set Condition: The code will set within 2.5 second, if the microprocessor senses high HSD
internal temperature. The high temperature is caused by over current.
FCM, ORC RUN ONLY DRIVER OVER VOLT - ACTIVE
When Monitored: The FCM uses a microprocessor controlled transistor (high side driver)
to supply power to the ORC. The microprocessor monitors the high side driver (HSD)
battery voltage when the ignition is in the run position.
Set Condition: The code will set if the microprocessor senses HSD battery voltage is over
30 volts.
32
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Page 62 of 4284

FCM, ORC RUN ONLY DRIVER SHORT TO GROUND - ACTIVE
When Monitored: When the ignition is turned OFF, the microprocessor controlled
transistor (high side driver) places a diagnostic voltage on the ORC Run-Start circuit for
60 seconds. An open high side driver (HSD) circuit voltage is between 2.4 and 5.0 volts.
Set Condition: This code will set within 10 second, if the microprocessor senses 2.4 to 5.0
volts on the HSD. Note: the diagnostic voltage will only last for 60 seconds after the
ignition is turned off.
ORC, LOSS OF IGNITION RUN ONLY - ACTIVE
When Monitored: With the ignition in the run only position the ORC monitors the ORC
Run Only Driver circuit for proper system voltage.
Set Condition: If the voltage on the ORC Run Only Driver circuit drops below 4.5 volts,
the code will set.
POSSIBLE CAUSES
VERIFYING ORC RUN ONLY DRIVER CODES
CHECK BATTERY VOLTAGE
FCM, RUN ONLY DRIVER OVER VOLTAGE
ORC, RUN ONLY OPEN TEST
FCM, RUN ONLY OPEN TEST
IPM, RUN ONLY OPEN TEST
ORC RUN ONLY DRIVER CIRCUIT OPEN
FCM, RUN ONLY SHORT TEST
IPM, RUN ONLY SHORT TEST
ORC RUN ONLY DRIVER CIRCUIT SHORT
33
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FCM, ORC RUN ONLY DRIVER OPEN - ACTIVE ÐContinued
Page 63 of 4284

TEST ACTION APPLICABILITY
1 Ensure that the battery is fully charged.
WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE OCCUPANT RESTRAINT CONTROLLER IS DROPPED
AT ANY TIME, IT MUST BE REPLACED.
Disconnect the Occupant Restraint Controller Connector.
NOTE: Check connectors - Clean and repair as necessary.
WARNING: TURN IGNITION ON, THEN RECONNECT THE BATTERY.
With the DRBIIIt, read the active FCM DTCs.
Turn the ignition off.
With the DRBIIIt, read the active FCM DTCs.
NOTE: The ORC RUN ONLY DRIVER OPEN code may not set until the
ignition key is turned off.
Select the active FCM DTC that was displayed on the DRB.All
1. ORC RUN ONLY DRIVER OPEN
Go To 2
2. ORC RUN ONLY DRIVER OVER VOLTAGE
Go To 5
3. ORC RUN ONLY SHORT TO GROUND
Go To 6
4. ORC RUN ONLY DRIVER OVER CURRENT
Go To 6
5. ORC RUN ONLY DRIVER OVER TEMP
Go To 6
6. None of the above.
Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
NOTE: When reconnecting airbag system components the Ignition must be
turned off and the Battery must be disconnected.
2WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE OCCUPANT RESTRAINT CONTROLLER IS DROPPED
AT ANY TIME, IT MUST BE REPLACED.
Disconnect the Occupant Restraint Controller.
TURN THE IGNITION ON, THEN RECONNECT THE BATTERY.
Connect a test light to ground and the ORC Run Only Driver circuit at the Occupant
Restraint Controller connector.
Cycle the ignition switch from ON to OFF.
With the DRBIIIt, read the active FCM DTCs.
Does the DRB show an active ORC RUN ONLY DRIVER OPEN code?All
Ye s®Go To 3
No®Replace the Occupant Restraint Controller in accordance with
Service Instructions. WARNING: make sure the battery is discon-
nected and wait 2 minutes before proceeding.
Perform AIRBAG VERIFICATION TEST - VER 1.
NOTE: When reconnecting airbag system components the Ignition must be
turned off and the Battery must be disconnected.
34
AIRBAG
FCM, ORC RUN ONLY DRIVER OPEN - ACTIVE ÐContinued
Page 64 of 4284

TEST ACTION APPLICABILITY
3 Disconnect the Front Control Module.
NOTE: Check connectors - Clean and repair as necessary.
Measure the resistance of the ORC Run Only Driver circuit between the Front
Control Module connector and the Occupant Restraint Controller connector.
Is the resistance below 1.0 ohms ?All
Ye s®Replace the Front Control Module.
Perform AIRBAG VERIFICATION TEST - VER 1.
No®Go To 4
NOTE: When reconnecting airbag system components the Ignition must be
turned off and the Battery must be disconnected.
4 Gain access to the connectors on the bottom of the IPM.
Disconnect the IPM C7 connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the ORC Run Only Driver circuit between the IPM C7
connector and the Occupant Restraint Controller connector.
Is the resistance below 1.0 ohms ?All
Ye s®Replace the IPM.
Perform AIRBAG VERIFICATION TEST - VER 1.
No®Repair the open ORC Run Only Driver circuit.
Perform AIRBAG VERIFICATION TEST - VER 1.
NOTE: When reconnecting airbag system components the Ignition must be
turned off and the Battery must be disconnected.
5 Measure the battery voltage.
Is the voltage above 30.0 volts?All
Ye s®Refer to Charging Category for the P1594 Charging System Too
High symptom.
Perform AIRBAG VERIFICATION TEST - VER 1.
No®Replace the Front Control Module.
Perform AIRBAG VERIFICATION TEST - VER 1.
6WARNING: TURN IGNITION OFF, DISCONNECT THE BATTERY AND WAIT
TWO MINUTES BEFORE PROCEEDING.
Disconnect Occupant Restraints Controller.
NOTE: Check connectors - Clean and repair as necessary.
Measure the resistance of the ORC Run Only Driver circuit between the Front
Control Module connector and ground.
Is the resistance below 500.0 Kohms?All
Ye s®Go To 7
No®Replace the Front Control Module.
Perform AIRBAG VERIFICATION TEST - VER 1.
NOTE: When reconnecting airbag system components the Ignition must be
turned off and the Battery must be disconnected.
35
AIRBAG
FCM, ORC RUN ONLY DRIVER OPEN - ACTIVE ÐContinued