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The stop light switch is spring loaded & pops out when the brake pedal is pushed in & pushed in when the brake pedal returns you need to adjust it so as in is pushed right in & lock it in that position, then check if the brake lights come on when the pedal is pushed in you may have to re adjust it to get it right.....hope this helps.....cheers
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Do you know how to test using a DVOM - digital volt ohm meter ? Is there B+ voltage going into the brake light switch ? An coming out when the brake pedal is pressed ? What fuse's ? There is only one fuse for the brake lights !
The BRAKE SW fuse in the RH I/P fuse block supplies battery positive voltage to the normally-open stop lamp switch. When you press the brake pedal the switch contacts close and battery positive voltage is supplied to the left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The left and right stop lamp along with the CHMSL are grounded at G302.
Do you know about the right insturment panel fuse box ?
Stop Lamps Inoperative
Step
Action
Yes
No
Schematic Reference: Exterior Lights Schematics
1
Did you perform the Lighting System Diagnostic System Check?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Lighting Systems
2
Press the brake pedal.
Do all of the stop lamps illuminate?
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 3
3
Are all the stop lamps inoperative?
YES - Go to Step 4
NO - Go to Step 7
4
Inspect the BRK SW fuse.
Is the fuse open?
YES - Go to Step 14
NO - Go to Step 5
5
Disconnect the stop lamp switch.
Using a test lamp connected to ground, probe the battery supply voltage circuit of the stop lamp switch connector.
Does the test lamp illuminate?
YES - Go to Step 6
NO - Go to Step 13
6
Install a fused jumper between the battery supply voltage circuit and the stop lamp switch signal circuit of the stop lamp switch connector.
Do the stop lamps illuminate?
YES - Go to Step 12
NO - Go to Step 17
7
Determine if the center high mounted stop lamp is inoperative or the stop/turn lamps are inoperative.
Are the stop/turn lamps inoperative?
YES - Go to Step 8
NO - Go to Step 9
8
Do the turn lamps operate normally?
YES - Go to Step 17
NO - Go to Turn Signal Lamps and/or Indicators Inoperative
9
Disconnect the center high mounted stop lamp.
Using a test lamp connected to ground, probe the stop lamp switch signal circuit of the center high mounted stop lamp at the harness connector.
Press the brake pedal.
Does the test lamp illuminate?
YES - Go to Step 10
NO - Go to Step 15
10
Using a test lamp, probe between the stop lamp switch signal circuit and the ground circuit of the center high mounted stop lamp with a test lamp.
Press the brake pedal.
Does the test lamp illuminate?
Go to Step 11
Go to Step 16
11
Inspect for poor connections at the harness connector of the center high mounted stop lamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 20
Go to Step 19
12
Inspect for poor connections at the harness connector of the stop lamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 20
Go to Step 18
13
Repair a open or high resistance in the battery supply voltage circuit of the stop lamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
14
Repair a short to ground in one of the following circuits:
• The battery supply voltage circuit of the stop lamp switch
• The stop lamp switch signal circuit of the stop lamp switch
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
15
Repair a open or high resistance in the stop lamp switch signal circuit of the center high mounted stop lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
16
Repair an open or high resistance in the ground circuit of the center high mounted stop lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
17
Repair an open or high resistance in the stop lamp switch signal circuit of the stop lamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
18
Verify the stop lamp switch adjustment. Refer to Stop Lamp Switch Adjustment . If OK, replace the stop lamp switch. Refer to Stop Lamp Switch Replacement .
Did you complete the repair?
Go to Step 20
--
19
Replace the center high mounted stop lamps. Refer to High Mount Stop Lamp Replacement .
Did you complete the repair?
Go to Step 20
--
20
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2
DTC P1574 Stoplamp Switch Circuit
The cruise release switch is a normally closed switch. The stop lamp switch signal circuit is a normally open switch. When the brake pedal is released, the engine control module (ECM) detects a high voltage signal on the torque converter clutch (TCC) brake switch/cruise control release signal circuit and a low signal voltage signal on the stop lamp switch signal circuit.
Diagnostic Aids
In order to avoid a misdiagnosis, perform the following:
• Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation .
• Inspect for proper adjustment of the stop lamps. Refer to Stop Lamp Switch Adjustment .
• For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
2
Do the stop lamps work properly?
YES - Go to Step 3
NO - Go to Stop Lamps Inoperative
3
Test the stop lamp switch signal circuit for an open or for a high resistance between the body control module (BCM) and the engine control module (ECM). Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
YES - Go to Step 6
NO - Go to Step 4
4
Inspect for poor connections at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
YES -- Go to Step 6
NO - Go to Step 5
5
Replace the ECM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?
YES - Go to Step 6
--
6
Use a scan tool in order to clear the DTCs.
Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?
Go to Step 2
System OK
There's a switch on the brake pedal arm that turns the light on when you press the brake pedal.
The switch needs to be adjusted or replaced.
Hope this helps.
Summary:VEHICLE DESCRIPTION: PASSENGER VEHICLES EQUIPPED WITH ADJUSTABLE PEDALS. IF THE GREASE FROM THE ADJUSTABLE PEDAL ASSEMBLY ENTERS THE STOP LAMP SWITCH, IT CAN CONTAMINATE THE CONTACTS LEADING TO CARBON BUILD UP, AND POTENTIALLY, A SHORT CIRCUIT.
Consequence:A SHORT CIRCUIT COULD LEAD TO EITHER THE BRAKE LAMPS STAYING ON, OR TO A LOSS OF BRAKE LAMP FUNCTION, INCREASING THE RISK OF A CRASH.
Remedy:DEALERS WILL REPLACE THE BRAKE LAMP SWITCH AND WIPE DOWN THE ADJUSTABLE PEDAL ASSEMBLY TO REMOVE EXCESS GREASE. OWNER NOTIFICATION BEGAN MARCH 22, 2001. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT FORD AT 1-800-392-3673.
Stop Lamp Circuit Description
The STOP HAZ fuse in the IP junction block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to the center mounted stop lamp (CHMSL) and both left and right stop lamp assemblies. The left stop lamp is grounded at G304 and the right stop lamp is grounded at G304.
2
Inspect the 20 Amp STOP HAZ fuse.
Is the STOP HAZ fuse open?
YES - Go to Step 11
NO - Go to Step 3
3
Use a test lamp in order to backprobe connector C1 of the brake switch connector between terminal A and ground. Refer to Circuit Testing in Wiring Systems.
Does the test lamp light?
YES - Go to Step 4
NO - Go to Step 5
4
With the brake switch closed, Test for positive battery voltage at terminal B of connector C1. Refer to Circuit Testing in Wiring Systems.
Is voltage present?
YES - Go to Step 6
NO - Go to Step 7
5
Repair the open or short to ground in the Fuse Output-Battery between the fuse block and the brake switch. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
YES - System OK
--
6
Use a test lamp in order to backprobe the turn/hazard headlamp switch assembly connector C2 terminal A and ground.
Depress the brake pedal.
Does the test lamp light?
YES - Go to Step 8
NO - Go to Step 9
7
Inspect the adjustment of the brake switch. If the adjustment is correct, replace the brake switch.
Is the repair complete?
YES - System OK
--
8
Replace the turn/hazard headlamp switch assembly.
Is the repair complete?
System OK
--
9
Repair the open in Stop Lamp Switch Output between the brake switch and the turn/hazard headlamp switch assembly. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
System OK
--
10
With brake switch open test terminal A of the brake switch for continuity to ground. Refer to Circuit Testing in Wiring Systems.
Is ground present?
YES - Go to Step 11
NO - Go to Step 12
11
Repair short to ground in Fuse Output-Battery Circuit. Refer to Wiring Repairs in Wiring Systems.
Is repair complete?
System OK
--
12
Test the Stop Lamp Switch Output Circuit for continuity to ground. Refer to Circuit Testing in Wiring Systems.
Is ground present?
YES - Go to Step 13
NO - Go to Step 14
13
Repair short to ground in the Stop Lamp Switch Output Circuit. Refer to Wiring Repairs in Wiring Systems.
Is repair complete?
System OK
--
14
Test terminals F,G,B and C on the Hazard Warning Switch for continuity to ground. Refer to Circuit Testing in Wiring Systems.
Is ground present?
Go to Step 15
--
15
Repair short to ground in suspect CKT. Refer to Wiring Repairs in Wiring Systems.
Is repair complete?
System OK
--
replace the stop lamp switch. It's right behind the brake pedal and it should take care of your problem. Double check it by listening for a clicking sound at the shifter when you step on the brake to release it from park. If you don't hear the clicking sound then its the stop lamp switch. If you do hear the clicking sound then you have two problems. The stop lamp switch and the shifter assembly. There is also a manual override for the shifter located right behind the shifter. Its the little spring loaded flap. Stick a pencil in there to release the shifter.
Remove lower steering column cover and knee blocker panel from instrument panel.
With the brake pedal fully pressed, rotate the stop lamp switch counter clockwise 27 degrees and remove switch from the mounting bracket.< Just turn Count clockwise until you feel it unlock from its previous location, then pull it towards you>
Disconnect wire connector from stop lamp switch by depressing the lock tabs holding stop lamp switch to mounting bracket and remove switch.
Its recommended to have someone push the brake pedal for you, can be tough to push it while trying to get his out.
Connect the harness connector to the stop lamp switch.
While pressing the brake pedal, insert switch into the keyed hole in the bracket and rotate the switch into the locked position.
Gently pull back on the brake pedal until the pedal will go no further. This will cause the switch plunger to ratchet backward to the correct position. No further adjustment is necessary.
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