2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2317
2. Test for 6.5-7.0K ohm between the signal terminal 3 and the B+ terminal 4 with the switch in the released position.
瀚慖f not the specified value, replace the S2 transmission manual shift switch.
3. Test for 1.5-2.0K ohm between the signal terminal 3 and the B+ terminal 4 with the switch in the plus position.
瀚慖f greater than the specified range, replace the S2 transmission manual shift switch.
4. Test for 3.8-4.0K ohm between the signal terminal 3 and the B+ terminal 4 with the switch in the minus position.
瀚慖f greater than the specified range, replace the S2 transmission manual shift switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Shift Lever Replacement (See: Steering and Suspension/Steering/Steering Column/Service and Repair/Shift Lever Replacement) for
automatic transmission manual shift switch replacement.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for body control module replacement, setup, and
programming.
6L45/6L50/6L80/6L90 - Automatic Transmission
DTC P0815, P0816, P0826, or P1876
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.
DTC Descriptors
DTC P0815
- Upshift Switch Circuit
DTC P0816
- Downshift Switch Circuit
DTC P0826
- Up and Down Shift Switch Circuit
DTC P1876
- Up and Down Shift Enable Switch Circuit Low Voltage
Diagnostic Fault Information
Circuit/System Description
The driver shift request (DSR), also known as the TAP Up/Downshift manual shift function, allows the driver to select the desired range of gears
for current driving conditions. The DSR shift system is activated when the gear selector is in the manual position. The DSR system is deactivated in
all other range positions. Pressing the plus (+) switch once will command the body control module (BCM) to signal the transmission control
module (TCM) to upshift to the next high gear. Pressing the minus (-) switch once will command the BCM to signal the TCM to downshift to the
next lowest or previous gear. The TCM will not allow a downshift if the transmission is compromised by over-speeding. The automatic
transmission manual shift switch is comprised of three different resistors values in series and two switches. The BCM supplies a 12 volt circuit to
the automatic transmission manual shift switch. The signal circuit varies the voltage back to the body control module depending on which switch is
depressed.
Conditions for Running the DTC
