2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1038
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
With a scan tool observe the Tow/Haul switch parameter in Body Controls data list. With the ignition On or engine running, operate the Tow/Haul
switch several times, and observe the parameter as you operate the switch. The parameter should toggle between Active and Inactive when the
switch is operated.
Circuit/System Testing
1. Ignition Off, transmission in Park, disconnect the Tow/Haul switch connector.
2. Test for less than 1 ohm of resistance between the Tow/Haul switch signal circuit terminal B and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition On, verify the scan tool Tow/Haul parameter displays Inactive.
瀚慖f not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
4. Install a fused jumper between the signal circuit and ground. Verify the scan tool parameter displays Active.
瀚慖f not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the
BCM.
5. If all circuits test normal, replace the Tow/Haul switch.
6. If the electrical circuit checks are OK and the tow/haul shift pattern is not occurring, there may be a mechanical/hydraulic condition that
prevents tow/haul operation. Refer to Symptoms - Automatic Transmission (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Testing and Inspection/Symptom Related Diagnostic Procedures/6T70/6T75 - Automatic Transmission/Symptoms -
Automatic Transmission).
Component Testing
Verify the Tow/Haul Mode parameter on the scan tool while cycling the tow/haul switch.
1. Ignition Off, transmission in Park, disconnect the transmission Tow/Haul switch assembly.
2. Test for infinite resistance between the Tow/Haul switch with the switch in the Open position.
瀚慖f not the specified value, replace the Tow/Haul switch assembly.
3. Depress and hold the Tow/Haul switch.
4. Test for less than 1 ohm of resistance between the Tow/Haul switch signal circuit terminals B and A while the switch is depressed.
瀚慖f greater than the specified value, replace the Tow/Haul switch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming.
* Automatic Transmission Range Selector Lever Replacement (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Shifter
A/T/Service and Repair/6T70/6T75 - Automatic Transmission/Automatic Transmission Range Selector Lever Replacement)
P0100
DTC P0100-P0103 (LAU)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
