Question about Mercury Grand Marquis

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The interior lights come on when all switches are turned off and also the cruise control no longer works. I have been told that it could lie in the GEM module which controls all these things. To replace this part, where is it located

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It should be behind the dash behind glove box i believe

Posted on Sep 13, 2010

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2005 trailblazer cruise control not working or the cruise control light not working


Which engine does your trailblazer have 5.3 or 4.2 L
Cruise Control Description and Operation (5.3L)
Cruise Control Description and Operation (4.2L)
makes a difference ! The best way to start diagnostic's is with a scan tool . May have DTC'S diagnostic trouble codes .
DTC P1574 Stop Lamp Switch Circuit
DTC P0568 Cruise Control Set Switch Circuit
DTC P0567 Cruise Control Resume Switch Circuit
Plus with a scan tool you can see if the cruise control switch is inputing to PCM. Data list .
The cruise control resume/accel switch is an input to the powertrain control module (PCM). The PCM uses the cruise control resume/accel switch signal circuit in order to detect when the driver has requested to accelerate the set vehicle speed or to resume the cruise control system. The PCM detects a voltage signal on the cruise control resume/accel switch signal circuit when the switch is applied. This DTC sets if the PCM senses voltage on the cruise control resume/accel switch signal circuit for longer than 90 seconds.
Cruise Control Indicator Inoperative (4.2L)
Turn OFF the ignition.
Install a scan tool.
Turn ON the ignition, with the engine OFF.
With the scan tool, Command the Cruise Control Lamp Test parameter ON, in the instrument panel cluster (IPC) Output Controls.
Does the Cruise indicator illuminate in the IPC?
YES - Go to Step 3
no - Go to Step 4
3
Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
YES - Go to Step 7
NO - Go to Step 6
4
Inspect for poor connections at the harness connector of the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
YES - Go to Step 7
NO - Go to Step 5
5
Replace the IPC. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?
YES - Go to Step 7
--
6
Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?
Go to Step 7
--
7
Operate the system in order to verify the repair.
Does the system operate properly?
System OK
Go to Step 2

Cruise Control Inoperative/Malfunctioning (4.2L)

Install a scan tool.
Turn ON the ignition, with the engine OFF.
Press the cruise ON/OFF switch OFF.
With the scan tool, observe the Cruise ON/OFF switch parameter in the powertrain control module (PCM) Cruise Control Data list.
Does the Cruise ON/OFF switch parameter display OFF?

Your best bet mite be to take your vehicle to the dealer .

Dec 24, 2016 | Cars & Trucks

1 Answer

My cruise control no longer works on my 2003 Mitsubishi Outlander. What may be the problem?


  1. Disconnected or damaged vacuum lines to main cruise control unit;
  2. Bad or misadjusted brake light switch (most likely);
  3. Defective cruise control switch;
  4. Failed main cruise control unit.

May 14, 2015 | Mitsubishi Cars & Trucks

1 Answer

Cruise control stopped working on a 08 Chevrolet HHR


I just got the perfect answer to this yesterday. It's a $5 fix! Check your brake lights. If any of them are out, it will make the cruise control not function. Turns out all 4 of the 3rd set of brake lights were out. We replaced the 4 of them and the cruise control immediately became functional again. I got this tip from a gentleman in the service department at a local Chevy dealer.

Feb 14, 2013 | 2008 Chevrolet HHR 2.2

1 Answer

2005 chevy trailblazer - no cruise control and brake lights only work when key is turned off


I would check the turn signal switch. The cruise and turn signal are on the same switch. The brake lights go through the switch before going to the brake lights. And the turn signals don't work with the ignition off.

Jan 30, 2013 | 2005 Chevrolet TrailBlazer

2 Answers

The cruise control on my 2001 Mitsubishi Montero Sport XS is not working after I took my car in for a complete interior / exterior detailing. What do you suggest I check? It has worked beautifully since...


well the first thing is to check all your fuses, then i would take a look under the hood for any broken or disconnected vacuum lines,this is what i would check first, hope this is helpful.

May 13, 2010 | 2001 Mitsubishi Montero Sport 4WD

2 Answers

Cruise control problem


There are 3 places on the Rav4 where fuses can be located and checked. for the cuise control.

The back of the cruise control stacking switch has been know to fail (fall apart) and Toyota issued a TSB with replacement switch.

if it is the fuses then they most likely are related to cruise control system: Stop, Dome, Gauge and Igniton
The interior fuse box
The main engine fuse box (by brake fluid)
Cruise control ECU is under the glovebox.
Cruise control actuator is under hood (by driver side brake fluid/booster)Throttle position sensor (to detect if your foot is on gas pedal)
Cruise control switch on the clutch pedal too (if you have 5spd manual)
Brake lights are the deactivate signal for the cruise control


Aug 13, 2009 | 1998 Toyota RAV4

1 Answer

Cruise control no longer works. Cruise light comes


Make sure the cable from the cruise control motor to throtle is not broken or unattached.

Jul 08, 2009 | 2003 Chevrolet Impala

1 Answer

Hi there. My car's signal lights will not work. We have checked the bulds and fuses and they are all in working order. A friend of ours told us it could be the Hazard light switch which also controls...


Same thing with my 2002 intrigue, one night the turn signals stopped working. hazards worked. then after a few minutes they worked just fine. it has been about two weeks since and had no problems!

Aug 07, 2008 | 2002 Oldsmobile Intrigue

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