2010 Cadillac CTS Sedan AWD V6-3.0L Technical Service Bulletin # 09-08-44-010C Date: 091019

2010 Cadillac CTS Sedan AWD V6-3.0L Technical Service Bulletin # 09-08-44-010C Date: 091019

Electrical - Various Electrical Failures/Battery Drain

ENGINEERING INFORMATION

Bulletin No.: 09-08-44-010C

Date: October 19, 2009

Subject: EI09087 - Integrated Center Stack Blanks Intermittently, Loss of Radio Function, Loss of HVAC Controls, Loss of Communication with

Radio DTC or Various Electrical Concerns (Inspect Rear Fuse Block Connector)

2010 Cadillac CTS Sedan AWD V6-3.0L Page 200

Models:

2008-2010 Cadillac CTS, CTS Wagon

Supercede:

This bulletin is being revised to update the subject line, model year, repair information and add the CTS Wagon. Please discard Corporate Bulletin

Number 09-08-44-010B (Section 08 - Body and Accessories).

Condition

Some customers may comment on various electrical concerns with the following systems:

- Power door locks inoperative

- No start due to a dead battery or battery drain condition

- Fuel pump relay Inoperative

- Trunk release inoperative

- Rear defrost inoperative

- Fuel door release inoperative (Export Only)

Upon further investigation, the following diagnostic trouble codes may also be present: DTC U1084, U1059, U0140 (lost communication), B1325,

B0081 or B0074 (general electrical failure).

Cause

This condition may be caused by a loose connection at the rear fuse block connector X1, resulting in intermittent battery positive, ground, or signals

to the above systems.

Correction

Note

There are two bolt designs used to secure the fuse block connector X1.

First Design

In vehicles built prior to May 2009, the shoulder bolt in this connector will not stop turning - this is design intent. First, attempt to tighten the bolt in

the middle of the connector while listening for an audible click. This click should be heard within one revolution and heard every revolution

thereafter. If no click is heard until several revolutions, the connector may not have been fully seated.

Note

Do not exceed 4 +/- 1 Nm (35.4 lb in) torque as the vehicle may have the second design bolt. Refer to Second Design below.

This click should be heard within one revolution and heard every revolution thereafter. If no click is heard until several revolutions, the connector

may not have been fully seated.

Second Design

Beginning in about May 2009, a new rear fuse block connector was implemented that has a connector bolt that does not spin freely after it reaches

the end of the thread travel. The release of this new connector was staggered based on the vehicle's electrical options, so no definite VIN breakpoint

can be provided. If the bolt can reach a torque of 4 +/- 1 Nm (35.4 lb in), it has the new style connector. When servicing this rear fuse block, do not

over torque the bolt or it may break the boss for the bolt out of the fuse block. All 2010 model year vehicles have the second design bolt.

Remove the battery access door to gain access to the rear fuse block. Proceed with the following steps:

1. Identify which design bolt the connector has and tighten appropriately per the above instructions. The first design will click with each

revolution once it is fully seated. The second design must not be torqued beyond 4 +/- 1 Nm (35.4 lb in).

2010 Cadillac CTS Sedan AWD V6-3.0L Page 201

Important

Ensure that the connector is fully seated to the fuse block.

2. To ensure that the connector is fully seated, press both ends of the connector at the same time into the fuse block until you feel it stop.

3. Measure the connector in the location shown above to ensure it is fully seated into the fuse block. The measurement should be less than 9 mm

(0.35 in) and equal front to rear. Measure the connector engagement between the edge of the fuse block (1) and the edge of the black

connector (2). The dimension must be less than 9 mm (0.35 in). If it is not, press the connector into fuse block and take the measurement

again.

Note

The connector may spring back slightly or rock slightly end to end. Getting the connector evenly engaged and below the 9 mm (0.35 in)

dimension ensures reliable electrical function.

4. Recheck the system(s) operation. If the system(s) is now functioning properly, the repair is complete. If it is not, recheck the connector

measurement found in Step 3. If it will not press in below 9 mm (0.35 in), and the condition is still present, replace the fuse block. Refer to

Wiring Systems and Power Management in SI. If the measurement is good (below 9 mm (0.35 in)), refer to published diagnosis and repairs

in SI to correct the concern.

Note

If all the steps above are completed and the condition is still present, refer to Corporate Bulletin Number 08-08-44-019D.

Warranty Information

For vehicles repaired under warranty, use the table.