This 2011 Cadillac DTS came in with the complaint that the battery will go dead if the car sits for more than 12 hours. I traced the drain to the Driver’s Door Module fuse (DDM) in the rear underseat fuse block. I used an amp meter connected in series between the battery negative terminal and … Continue reading “2011 Cadillac DTS, Battery Goes Dead Overnight”
This 2000 Cadillac Deville came in with the complaint that the anti theft system lights and messages were on but the vehicle always cranked up just fine. Of course when the vehicle was dropped off at my shop all of the lights were out and everything was normal. I did a code check and … Continue reading “2000 Cadillac DeVille, B1009 Anti Theft Warning Message and Security Light On”
This 1998 Cadillac Deville came in with the complaint that with the a/c on there was heat coming out of the passenger side vents. Codes B1340 and B1341 were present in the HVAC system. Both codes are for faults with the air mix door actuators. The B1340 is for air mix door #1 (driver’s side) … Continue reading “1998 Cadillac Deville, Passenger Side Vents Hot with A/C On”
This 2000 Cadillac Deville Came in with the complaint of running poorly and a code P0102 was present. The customer had already replaced the MAF (mass air flow) sensor and tried to replace the harness connector. Why anyone would consider this a repair is beyond me. Looking at MAF data, the grams per second and … Continue reading “2000 Cadillac DeVille, Runs Poorly Code P0102”
This 2001 Cadillac Deville came in with the complaint that the driver’s side vent temperature stays hot all of the time. I checked codes in the instrument panel module and found a code B0408 stored for a fault in the air mix one actuator. With the B0408 code the problem could have easily have been … Continue reading “2001 Cadillac Deville, Driver’s Side Air Stuck, B0408”
This 2001 Cadillac DeVille DTS came in with the complaint that the passenger side air was stuck on cold. There was a code B0429 stored in the Instrument Panel Module. B0429 relates to a fault with the passenger temperature door actuator assembly. To gain access to the passenger side temperature door actuator the glove box … Continue reading “2001 Cadillac Deville DTS, Passenger Side Air Stuck on Cold”
This 2003 Cadillac Deville DTS came in with the complaint that the blower motor does not work most of the time. Sometimes it will blow but it seems to blow slower than it should. Using a test light and a jumper wire, I connected one end of my test setup to the purple wire. Then … Continue reading “2003 Cadillac Deville, Blower Does Not Work”
This 2001 Cadillac Deville came in with multiple complaints with the rear lighting. I will try to describe as much as possible. With the trunk open the license plate and trunk lights would glow. If the park lights were turned on the two previously mentioned lights would go out. If you click on the picture … Continue reading “2001 Cadillac DeVille, Multiple Rear Lighting Problems”
This 2002 Cadillac Deville came in with the complaint that the customer could not control the air flow modes. The control panel showed movement but the air flow was stuck on vent and the air flow was not very strong. A quick visual check of the mode actuator found that someone had unplugged it so … Continue reading “2002 Cadillac Deville, B0248 B0249, No A/C Mode Control”
This 1997 Cadillac Deville came in with the complaint that the idle speed would sometimes be okay but most of the time as the engine warmed up it would get progressively higher and higher until the engine would run at about 3000 rpms on its own with no throttle input. The following picture shows the … Continue reading “1997 Cadillac Deville, Erratic / High Idle, Code P0507”