Adjustable Pedals Cadillac Escalade GMT800

Fastener Tightening Specifications

Fastener Tightening Specifications

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Begin adjustable pedal system diagnosis with the DIAGNOSTIC SYSTEM CHECK - ADJUSTABLE PEDALS . The Diagnostic System Check will provide the following information

1. The identification of the control modules which command the system.
2. The ability of the control modules to communicate through the serial data circuit.
3. The identification of any stored diagnostic trouble codes and their status.

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. 2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular conditions
2. 4. The symptom list in Symptoms will determine the correct diagnostic procedure to use.
3. 5. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.

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Driver Seat Module

Pedal Position: The scan tool displays 0.0 to 5.0 volts. The voltage displayed is the input to the driver seat module from the adjustable pedal motor position sensor.

Pedal Aft Switch: The scan tool displays Active or Inactive. When the adjustable pedal switch is operated in the rearward direction the scan tool displays Active.

Driver Door Module

Pedal Forward Switch: The scan tool displays Active or Inactive. When the adjustable pedal switch is operated in the forward direction the scan tool displays Active.

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Circuit Description

The adjustable pedals (EAP) forward and rearward switches are inputs to the driver door module. The driver door module supplies the EAP switch assembly with a battery positive reference voltage. When the EAP switch is operated to the forward or rearward direction the forward or rearward switch signal circuit is closed to the reference voltage. In an active state the EAP forward or rearward switch signal circuit voltage is supplied to the driver door module through one of the 806 ohm resistors within the switch assembly. The resistors in the switch assembly enables the driver door module to recognize an invalid switch signal.

Conditions for Running the DTC

The system voltage must be between 9.0-16.0 volts.

Conditions for Setting the DTC

1. The driver door module sets a DTC B3604 when the EAP forward switch signal circuit is determined to be shorted to voltage or ground.
2. The driver door module sets a DTC B3605 when the EAP rearward switch signal circuit is determined to be shorted to voltage or ground

Action Taken When the DTC Sets

The EAP system will be disabled.

Conditions for Clearing the DTC

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present the DTC will be a history status code.
3. The history DTC will be cleared after 100 error free ignition cycles, or by using the scan tool clearing DTCs feature.

The numbers below refer to the step numbers on the diagnostic table.

1. 3. This step tests the resistance through the EAP switch while in an active state.
2. 4. This step tests the EAP switch signal circuit for a short to another circuit within the switch assembly while in an inactive state.

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The driver seat module monitors the location of the adjustable pedals using the brake pedal position sensor. The brake pedal position sensor is supplied with 5-volt reference and ground circuits from the driver seat module. The position sensor signal circuit is referenced from ground within the driver seat module. The signal voltage monitored by the driver seat module ranges from 0.39-4.58 volts and is determined by the wiper location on the resistor within the position sensor. The position sensor circuit voltage level is used by the driver seat module to determine the position of the adjustable pedals when storing or recalling memory position settings.

The system voltage must be between 9.0-16.0 volts.

The brake pedal position sensor signal circuit voltage level to the driver seat module is not within the 0.39-4.58 volt range.

The driver seat module will not store or recall EAP memory or exit position settings.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present the DTC will be a history status code.
3. The history DTC will be cleared after 100 error free ignition cycles, or by using the scan tool clearing DTCs feature.

Diagnostic Aids

A short to voltage on a sensor signal circuit or an open ground may effect other sensors using a common 5-volt reference and ground circuits causing the following DTCs to set

1. DTC B1825
2. DTC B2435
3. DTC B2440

The numbers below refer to the step numbers on the diagnostic table.

1. 3. Tests for the proper operation of the signal circuit in the low voltage range.
2. 4. Tests for the proper operation of the signal circuit in the high voltage range.
3. 5. Tests for a short to voltage in the 5-volt reference circuit.

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Important: The following steps must be completed before using the symptom table.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - ADJUSTABLE PEDALS»(/cadillac/escalade/gmt800-2001-2006/remont/accessories-control-systems/#adjustable-pedals) before using the symptom table in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to «ADJUSTABLE PEDALS DESCRIPTION AND OPERATION»(/cadillac/escalade/gmt800-2001-2006/remont/accessories-control-systems/#adjustable-pedals) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the adjustable pedal system. Refer to CHECKING AFTERMARKET ACCESSORIES in Wiring Systems.
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems.

Symptom List

Refer to Adjustable Pedals Inoperative, See Adjustable Pedals Inoperative .

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Removal Procedure

1. Remove the master cylinder from the brake booster. DO NOT disconnect the hydraulic brake pipes from the master cylinder. Refer to Master Cylinder Replacement (Vacuum Boost) or Master Cylinder Replacement (Hydraulic Boost) in Hydraulic Brakes.
2. Disconnect the brake assist pump motor wiring harness and vacuum hose (if equipped).
3. Remove the steering column from the vehicle. Refer to STEERING COLUMN REPLACEMENT in Steering Wheel and Column.
4. Remove the transmission range selector cable support bolt from the I/P reinforcement brace.
5. Remove the upper nut from the Instrument Panel (I/P) reinforcement brace at the I/P. NOTE: Avoid damaging the surrounding components while cutting.
6. Cut off the I/P reinforcement brace studs close to the I/P carrier.
7. Remove the lower I/P reinforcement brace bolt (1) from the electronic adjustable pedal (EAP) bracket.
8. Remove the I/P reinforcement brace.
9. Disconnect the electrical connectors from the following components: The adjustable pedals motor assembly The memory sensor connector (if equipped) The pedal position sensor The accelerator wiring harness connector
10. Remove the pushrod retaining clip (3) from the brake pedal pin (1).
11. Remove the brake pedal pushrod (2) and the stop lamp switch (4) from the brake pedal.
12. Remove the EAP bracket nuts (2) from the studs (3) at the bulkhead.
13. Remove the top EAP bracket bolt (1).
14. Move the brake booster forward until the studs are removed from the mounting holes.
15. Remove the EAP assembly from the vehicle.
16. Remove the cable retaining clip on the top of the bracket.
17. Adjust the accelerator pedal to the fully forward position using the following procedure. Remove the screws from cable housing at the top of the adjustable pedal motor. Twist the cable housing to unlock the cable from the motor. Remove the cable from the adjustable pedal motor. Attach a drill motor or equivalent to the adjustable pedal cable. Spin the cable until there is a distance of 21.4 mm from the accelerator transmission assembly cap to the small outer diameter of the adjuster pin.
18. Remove the adjustable pedal cable from the accelerator pedal: Twist the cable housing to unlock the cable from the accelerator pedal. Compress the secondary locking tabs located below the housing locking tabs and pull the cable from the accelerator pedal assembly. Important: Note the position of the brake pedal return spring (1).
19. Remove the nut from the brake pedal pivot bolt.
20. Remove the brake pedal pivot bolt.
21. Remove the brake pedal and return spring assembly from the bracket.

Installation Procedure

1. Install the brake pedal and return spring assembly to the bracket.
2. Install the brake pedal pivot bolt. NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
3. Install the nut to the brake pedal pivot bolt. Tighten Tighten the nut to 30 N.m (22 lb ft).
4. Hook the return spring (1) to the backside of the brake pedal assembly (2). Important: The adjustable pedals cable assembly must be installed in its original position and fastened with cable retaining clip to the top of the bracket. Make sure the cable is not twisted or binding.
5. Install the adjustable pedal cable to the accelerator pedal: Insert the adjustable cable into the accelerator pedal assembly until it is secured by the secondary locking tabs. Install and twist the cable housing to secure to the accelerator pedal assembly.
6. Install the cable retaining clip to the top of the bracket.
7. Install the EAP assembly to the vehicle.
8. Install the brake booster to its mounting position.
9. Install the top EAP bracket bolt (1). Tighten Tighten the nuts to 25 N.m (18 lb ft).
10. Install the EAP bracket nuts (2) to the studs (3) at the bulkhead. Tighten Tighten the nuts to 25 N.m (18 lb ft).
11. Install the brake pedal pushrod (2) and the stop lamp switch (4) to the brake pedal.
12. Install the pushrod retaining clip (3) to the brake pedal pin (1).
13. Connect the electrical connectors to the following components: The adjustable pedals motor assembly The memory sensor connector (if equipped) The pedal position sensor The accelerator wiring harness connector
14. Position the replacement I/P reinforcement brace and install the upper and lower bolts to maintain the position of the brace The lower bolt may be removed after the brace is in position. Important: Do not allow the assembly tool speed to exceed 350 rpm on fasteners with an adhesive patch.
15. Install the upper I/P reinforcement brace nut to the bolt. Tighten Tighten the nut to 22 N.m (16 lb ft).
16. Install the lower I/P reinforcement brace bolt (1) to the EAP bracket. Tighten Tighten the bolt to 25 N.m (18 lb ft).
17. Install the transmission range selector cable support bolt to the I/P reinforcement brace. Tighten Tighten the bolt to 10 N.m (89 lb in).
18. Install the steering column to the vehicle. Refer to STEERING COLUMN REPLACEMENT in Steering Wheel and Column. Install the lower I/P reinforcement brace bolt (2) after the column is in position.
19. Connect the brake assist pump motor wiring harness and vacuum hose (if equipped).
20. Install the master cylinder to the brake booster. Refer to or Master Cylinder Replacement (Hydraulic Boost) in Hydraulic Brakes.
21. Verify the operation of the adjustable pedals.

Important: Ensure that the brake pedal assembly is adjusted to its lowest position farthest from the drivers seat prior to removal of the accelerator assembly. Failure to do so could result in incorrect step-over height between the brake and accelerator pedals and improper function of the adjustable pedal system.

1. Disconnect the adjustable pedals motor electrical connector.
2. Remove the locking clip and disconnect the accelerator sensor connector.
3. Remove the adjustable pedals cable from the accelerator pedal assembly using the following procedure: 3.1. Twist the cable housing counterclockwise. 3.2. Using needle nose pliers or an equivalent, compress the secondary locking tabs located below the twist and lock tabs and remove the cable from the accelerator assembly.
4. Remove the accelerator mounting nuts from the accelerator bracket.
5. Remove the accelerator assembly from the vehicle.

1. Install the accelerator assembly to the vehicle. NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
2. Install the accelerator mounting nuts to the accelerator bracket. Tighten Tighten the nuts to 9 N.m (80 Lb in).
3. Install adjuster drive cable into accelerator assembly.
4. Twist the cable housing and confirm the cable is secure.
5. Connect the accelerator sensor connector and install the locking clip.
6. Connect the adjustable pedals motor electrical connector.
7. Verify the operation of the adjustable pedals.
8. Confirm that the accelerator sensor connector locking clip is installed properly.
9. Verify the operation of the accelerator pedal.

1. Disconnect the brake pedal position sensor electrical connector.
2. Remove the brake pedal position sensor bolt.
3. Remove the brake pedal position sensor from the vehicle.

1. Install the brake pedal position sensor to the vehicle. NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
2. Install the brake pedal position sensor bolt. Tighten Tighten the bolt to 9 N.m (80 Lb in).
3. Connect the brake pedal position sensor electrical connector.

The adjustable pedals system consists of the following components

1. The adjustable pedals position switch
2. The driver door module
3. The driver seat module
4. The adjustable pedals relay
5. The adjustable pedals motor
6. The brake pedal position sensor

The adjustable pedal system is controlled by the driver door module and the driver seat module and operation can occur only while the transmission selector lever is in the park position. The adjustable pedals assembly is moved forward or backward by a motor which is fixed to the brake pedal actuator with a drive cable to the accelerator pedal actuator. The adjuster motor is controlled by the driver door module through the adjustable pedals relay. The adjustable pedals relay supplies battery voltage and ground to the adjuster motor using two sets of relay coils and switch contacts. In an inactive state both of the relay switch contacts are closed to ground. The driver door module controls the adjuster motor by energizing one of the relay coils, closing the appropriate motor control circuit to the battery voltage supply contact. The adjuster motor is bidirectional and the direction of the pedal assembly travel is determined by which of the motor control circuits is switched to battery positive voltage while the other remains grounded.

The adjustable pedals forward and rearward switches are inputs to the driver door module. The driver door module supplies the switch assembly with a battery positive reference voltage. When the switch is operated to the forward or rearward direction the forward or rearward switch signal circuit is closed to the reference voltage. In an active state the forward or rearward switch signal circuit voltage is supplied to the driver door module through one of the 806 ohm resistors within the switch assembly. The resistors in the switch assembly enables the driver door module to recognize an invalid switch signal.

The adjustable pedals system is capable of operating in conjunction with the memory seat system. The driver seat module monitors the location of the adjustable pedals using the brake pedal position sensor. The brake pedal position sensor is supplied with 5-volt reference and ground circuits from the driver seat module. The position sensor signal circuit is referenced from ground within the driver seat module. The signal voltage monitored by the driver seat module ranges from 0.39 - 4.58 volts and is determined by the wiper location on the resistor within the position sensor. The position sensor signal circuit voltage level is used by the driver seat module to determine the position of the adjustable pedals when storing or recalling memory position settings. The memory 1 and 2 switches are an inputs to the driver door module and when a memory recall function is activated, the driver door module and driver seat module relay information through the Class 2 Serial Data circuit in order to operate the adjustable pedals assembly in the appropriate direction until the stored memory position is reached.

See also:
• DIAGNOSTIC SYSTEM CHECK - ADJUSTABLE PEDALS