2010 Cadillac CTS Sedan AWD V6-3.6L Page 450

2010 Cadillac CTS Sedan AWD V6-3.6L Page 450

4. Verify the scan tool Lumbar Sensor parameter is less than 1.0 V.

瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the MSM.

5. Install a 3 A fused jumper wire between the signal circuit terminal E and the appropriate 5 V reference circuit terminal listed below. Verify

the scan tool Lumbar Sensor parameter is greater than 4.75 V.

* Terminal D (LHD)

* Terminal C (RHD)

瀚慖f less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the

MSM.

6. If all circuits test normal, test or replace the lumbar position sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Front Seat Tilt Adjuster Actuator Replacement (See: Body and Frame/Seats/Power Seat Motor/Service and Repair/Front Seat Tilt Adjuster

Actuator Replacement)

* Front Seat Adjuster Actuator Replacement (See: Body and Frame/Seats/Power Seat Motor/Service and Repair/Front Seat Adjuster Actuator

Replacement)

* Driver Seat Outer Adjuster Rear Vertical Actuator Replacement (See: Body and Frame/Seats/Power Seat Motor/Service and Repair/Driver

Seat Outer Adjuster Rear Vertical Actuator Replacement)

* Front Seat Recliner Actuator Motor Replacement (See: Body and Frame/Seats/Power Seat Motor/Service and Repair/Front Seat Recliner

Actuator Motor Replacement)

* Seat Lumbar Sub System Replacement (without AHS) (See: Body and Frame/Seats/Service and Repair/Seat Lumbar Sub System

Replacement (Without AHS))Seat Lumbar Sub System Replacement (with AHS) (See: Body and Frame/Seats/Service and Repair/Seat

Lumbar Sub System Replacement (With AHS))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for MSM replacement, setup, and programming

B1860

DTC B1825, B1850, B1860, B2355, B2365, or B2375

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 B1825 01

- Seat Recline Position Sensor Circuit Short to Battery

DTC B1825 06

- Seat Recline Position Sensor Circuit Short to Ground or Open

DTC B1825 5A

- Seat Recline Position Sensor Circuit Plausibility Failure

DTC B1850 01

- Left Front Seat Lumbar Horizontal Position Sensor Circuit Short to Battery

DTC B1850 06

- Left Front Seat Lumbar Horizontal Position Sensor Circuit Short to Ground or Open

DTC B1850 5A

- Left Front Seat Lumbar Horizontal Position Sensor Circuit Plausibility Failure

DTC B2355 01

- Left Seat Front Vertical Position Sensor Circuit Short to Battery