Disclaimer2010 Cadillac CTS Sedan AWD V6-3.0L Technical Service Bulletin # 08-08-127-001B Date: 100610

Disclaimer2010 Cadillac CTS Sedan AWD V6-3.0L Technical Service Bulletin # 08-08-127-001B Date: 100610

Park Assist System - Inoperative/Lamp ON/DTC's Set

TECHNICAL

Bulletin No.: 08-08-127-001B

Date: June 10, 2010

Subject: Park Assist System Inoperative, Service Park Assist Message Displayed on Driver Information Center (DIC), DTC B1E3A and/or B0954,

B0955, B0956, B0957, B0958, B0959, B0960, B0961 Set (Replace Appropriate Object Sensor or Repair Harness)

Models:

2006-2008 Buick Lucerne

2008-2009 Buick Enclave

2006-2008 Cadillac DTS

2007-2009 Cadillac Escalade, SRX

2008-2010 Cadillac CTS

2007-2009 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2009 Chevrolet Traverse

2007-2009 GMC Acadia, Sierra, Yukon, Yukon XL

2007-2009 Saturn OUTLOOK

Equipped with Parking Assist (RPO UD7 or UFR)

Supercede:

This bulletin is being revised to clarify the text in the Condition, Cause and Correction sections and update the Warranty Information. Please

discard Corporate Bulletin Number 08-08-127-001A (Section 08 - Body and Accessories).

Condition

- Some customers may comment on a Service Park Assist message being displayed on the driver information center (DIC).

- The technician may observe with a scan tool DTC B1E3A and/or B0954, B0955, B0956, B0957, B0958, B0959, B0960, B0961 set as

Current or in History.

Cause

- This condition may be caused by a malfunctioning object sensor or a circuit fault on the 8 volt reference circuit.

Note

The 8 volt reference circuit serves all of the object sensors in parallel. A fault anywhere on the circuit or in any single sensor will affect all of

the sensors.

- When a single sensor malfunctions, the shared 8 volt reference circuit may be compromised, resulting in a DTC for each sensor.

Correction

Important

DO NOT replace all of the object sensors and/or the object alarm module.

If normal diagnosis does not reveal any concerns with the park assist system, perform the following diagnostic procedure:

1. Turn OFF the ignition.

Note

Depending on the model year of the vehicle the park assist system sensors are referred to as: object sensor or object alarm sensor.

2. Disconnect the harness connector at each of the object sensors. For the locations of the object sensors, refer to Master Electrical Component

List in SI.

3. Turn ON the ignition, with the engine OFF.

Important

With all of the object sensor harness connectors disconnected, multiple sensor DTCs will set and will not clear. Ignore these DTCs for

now.

4. Clear any DTCs that may be present.

5. Verify that DTC B1E3A does not reset as Current.

2010 Cadillac CTS Sedan AWD V6-3.0L Page 266

Important

Ensure each leg of the circuit is tested since the 8 volt reference circuit feeds all the sensors in parallel.

瀚慖f DTC B1E3A does set, test the 8 volt reference circuit for a short to voltage, short to ground or an open/high resistance. Repair the

circuit as necessary. Depending on the model year of the vehicle, refer to Body > Wiring Systems > Diagnostic Information and

Procedures > Wiring Repairs OR Power and Signal Distribution > Wiring Systems and Power Management > Diagnostic Information

and Procedures > Wiring Repairs in SI.

瀚慖f DTC B1E3A does not set proceed to Step 6.

6. Install each object sensor harness connector one at a time, checking for DTCs immediately after each sensor is connected. Verify DTC

B1E3A does not set as Current.

瀚慖f DTC B1E3A does set, replace the object sensor that was connected immediately before the DTC set.

7. Perform the diagnostic repair verification after completing the diagnostic procedure. Refer to Diagnostic Repair Verification in SI.

Parts Information

Warranty Information

For vehicles repaired under warranty, use the table.