CTS Sedan AWD V6-3.0L (2010)
Wiring Harness: Customer Interest
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)
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.