CHEVORLET TRAILBLAZER Service Repair Manual 02-06

ACCESSORIES & EQUIPMENT Adjustable Pedals - Bravada, Envoy & TrailBlazer SPECIFICATIONS FASTENER TIGHTENING SPECIFICATIONS Fastener Tightening Specifications SCHEMATIC AND ROUTING DIAGRAMS ADJUSTABLE PEDALS SCHEMATICS Fig. 1: Adjustable Pedals Schematic Courtesy of GENERAL MOTORS CORP. Application Specification Metric English Accelerator Mounting Nut 11 N.m 98 lb in Brake Pedal Pivot Bolt 25 N.m 19 lb ft Brake Pedal Sensor Bolt 9 N.m 80 lb in 2002-2009 Chevrolet TrailBlazer REPAIR MANUAL

COMPONENT LOCATOR ADJUSTABLE PEDALS COMPONENT VIEWS Fig. 2: Lower LF of the Passenger Compartment - Pedal Assembly Courtesy of GENERAL MOTORS CORP. Callouts For Fig. 2 Callout Component Name 1 Electronic Adjustable Pedals (EAP) Relay 2 C225 3 Electronic Adjustable Pedals (EAP) Assembly Connector 4 Accelerator Pedal Position (APP) Sensor

Fig. 3: Left Side of the I/P - Steering Column Courtesy of GENERAL MOTORS CORP. Callouts For Fig. 3 ADJUSTABLE PEDALS CONNECTOR END VIEWS Electronic Adjustable Pedals (EAP) Assembly Callout Component Name 1 Hazard Switch 2 Inflatable Restraint Steering Wheel Module Coil Connector C4 3 Inflatable Restraint Steering Wheel Module Coil Connector C2 4 Inflatable Restraint Steering Wheel Module Coil Connector C3 5 Electronic Adjustable Pedals (EAP) Switch 6 Turn Signal/Multifunction Switch 7 C201 8 Inflatable Restraint Steering Wheel Module Coil Connector C1

Electronic Adjustable Pedals (EAP) Relay Connector Part Information  174923-1  6-Way F Amp Multilock 070 Series (BK) Pin Wire Color Circuit No. Function 1 WH 5287 Adjustable Pedals Position Sensor 5-Volt Reference 2 PK 5289 Adjustable Pedals Position Sensor Signal 3 BN/WH 5288 Adjustable Pedals Position Sensor Low Reference 4 D-BU - Electronic Adjustable Pedals (EAP) Motor Rearward Control 5 RD - Electronic Adjustable Pedals (EAP) Motor Forward Control 6 - - Not Used

Electronic Adjustable Pedals (EAP) Switch DIAGNOSTIC INFORMATION AND PROCEDURES DIAGNOSTIC STARTING POINT - ADJUSTABLE PEDALS (WITH MEMORY) Begin adjustable pedal system diagnosis with the Diagnostic System Check - Adjustable Pedals . The Diagnostic System Check will provide the following information:  The identification of the control modules which command the system.  The ability of the control modules to communicate through the serial data circuit. Connector Part Information  12059561  6-Way F Metri-Pack Connectors, Mixed Series (BK) Pin Wire Color Circuit No. Function A PU 5286 Adjustable Pedals Relay Forward Control B RD - Electronic Adjustable Pedals (EAP) Motor Forward Control C OG 3040 Battery Positive Voltage D BK 2250 Ground E D-BU - Electronic Adjustable Pedals (EAP) Motor Rearward Control F OG/BK 5285 Adjustable Pedals Relay Rearward Control Connector Part Information  12064759  3-Way M Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A OG 5286 Adjustable Pedals Relay Forward Control B PK 5285 Adjustable Pedals Relay Rearward Control C BK 3240 Battery Positive Voltage

 The identification of any stored diagnostic trouble codes (DTCs) 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. DIAGNOSTIC STARTING POINT - ADJUSTABLE PEDALS (W/O MEMORY) Begin the adjustable pedal system diagnosis by reviewing the system Description and Operation. Reviewing the Description and Operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation information will also help you determine if the condition described by the customer is normal operation. Refer to Symptoms - Seats in order to identify the correct procedure for diagnosing the system and where the procedure is located. DIAGNOSTIC SYSTEM CHECK - ADJUSTABLE PEDALS Test Description The numbers below refer to the step numbers on the diagnostic table. 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 condition. 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. Diagnostic System Check - Adjustable Pedals Step Action Yes No 1 Install a scan tool. Does the scan tool power up? Go to Step 2 Go to Scan Tool Does Not Power Up in Data Link Communications 2 Attempt to establish communication with the following control modules:  Driver seat module  Driver door module Does the scan tool communicate with the listed control modules? Go to Step 3 Go to Scan Tool Does Not Communicate with Class 2 Device (W/O Immobilizer) Scan Tool Does Not Communicate with Class 2 Device (W/ Immobilizer) in Data Link Communications IMPORTANT: The engine may start during the following step. Turn

SCAN TOOL DATA LIST Driver Seat Module 3 1. Access the Class 2 Power Mode in the Diagnostic Circuit Check on the scan tool. 2. Rotate the ignition switch through all positions while observing the ignition switch power mode parameter. Does the ignition switch parameter reading match the ignition switch position for all switch positions? OFF the engine as soon as you have observed the Crank power mode. Go to Step 4 Go to Power Mode Mismatch in Body Control System 4 Select the display DTCs function on the scan tool for the following control modules:  Driver seat module  Driver door module Does the scan tool display any DTCs? Go to Step 5 Go to Diagnostic Trouble Code (DTC) List 5 Does the scan tool display any DTC that begins with a "U"? Go to Scan Tool Does Not Communicate with Class 2 Device (W/O Immobilizer) Scan Tool Does Not Communicate with Class 2 Device (W/ Immobilizer) in Data Link Communications Go to Step 6 6 Does the scan tool display B1000? Go to Diagnostic Trouble Code (DTC) List in Body Control System Go to Symptoms - Adjustable Pedals Scan Tool Parameter Data List Units Displayed Typical Data Value Operating Conditions: Ignition Off Pedal Position Sensor Data Volts 0.0-5.0

SCAN TOOL DATA DEFINITIONS Driver Seat Module Pedal Position The scan tool displays 0.0-5.0 volts. The voltage displayed is the input to the driver seat module from the adjustable pedal motor position sensor. DIAGNOSTIC TROUBLE CODE (DTC) LIST Diagnostic Trouble Code (DTC) List DTC B3606 Circuit Description 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. Conditions for Running the DTC Battery voltage to the seat module must be within 7-16 volts. Conditions for Setting the DTC The position sensor signal circuit voltage level to the driver seat module is not within the 0.39-4.58 volt range. Action Taken When the DTC Sets The memory recall functions will be disabled for as long as the DTC is current. Conditions for Clearing the DTC  The DTC will be stored as a history code when the fault is no longer present.  A history DTC will be cleared after completing 100 consecutive ignition cycles, or by using the scan tool clearing DTCs feature. Diagnostic Aids DTC Diagnostic Procedure Modules B3606 DTC B3606 Driver Seat Module B3607 DTC B3607 Driver Seat Module

If the DTC is only found in history, the fault may be intermittent. Refer toTesting for Intermittent Conditions and Poor Connections in Wiring Systems. Test Description The numbers below refer to the step numbers on the diagnostic table. 3: Tests for the proper operation of the circuit in the low voltage range. 4: Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens if you perform this test, the signal circuit is short to ground. 5: Tests for a short to voltage in the 5-volt reference circuit. DTC B3606 Step Action Values Yes No Schematic Reference: Adjustable Pedals Schematics Connector End View Reference: Adjustable Pedals Connector End Views 1 Did you perform the Adjustable Pedal Diagnostic System Check? - Go to Step 2 Go to Diagnostic System Check - Adjustable Pedals 2 1. Install a scan tool. 2. With a scan tool, observe the brake pedal position sensor parameter in the seat module Adjustable Pedal data list. Is the position sensor parameter within the specified range? 0.39-4.58 V Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 3 1. Disconnect the position sensor connector. 2. With a scan tool, observe the position sensor parameter. Is the position sensor parameter less than the specified value? 0.39 V Go to Step 4 Go to Step 8 4 1. Connect a 3-amp fused jumper wire between the 5-volt reference circuit terminal and the signal circuit terminal in the position sensor harness connector. 2. With a scan tool, observe the position sensor parameter. Is the position sensor parameter greater than the specified value? 4.58 V Go to Step 5 Go to Step 7 1. Disconnect the fused jumper wire.

5 2. Measure the voltage between the 5-volt reference circuit terminal and the low reference circuit terminal in the position sensor harness connector. Is the voltage measure greater than the specified value? 5.0 V Go to Step 6 Go to Step 10 6 Test the 5-volt reference circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? - Go to Step 15 Go to Step 12 7 Test the 5-volt reference circuit for one of the following conditions:  A short to ground  A high resistance  An open Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? - Go to Step 15 Go to Step 9 8 Test the signal circuit of the position sensor for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? - Go to Step 15 Go to Step 12 9 Test the signal circuit of the position sensor for one of the following conditions:  A short to ground  A high resistance  An open Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? - Go to Step 15 Go to Step 12 10 Test the low reference circuit of the position sensor for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? - Go to Step 15 Go to Step 11 Inspect for poor connections at the brake pedal position sensor. Refer to Testing for Intermittent Conditions and Poor

CHEVORLET TRAILBLAZER Service Repair Manual 02-06

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