Thursday, 22 July 2010 19:04

Corvette Re-Initialization Procedures

Written by Tom McGee and Jeffrey Webster

The most basic vehicles today are pretty much computers on wheels. The more sophisticated the car, the more computers and systems that need to be re-initialized each time you work on them. The complexity and the confusion grows with each new model year. Take, for example, one of the icons of the American automobile industry, the Chevrolet Corvette. From 1953 to present, the Corvette has evolved into a remarkable machine. But, like any other vehicle on the road, Corvettes suffer collision damage, and upon repair, there are many systems that need to be re-initialized.

ALLDATA Collision provides manufacturers’ (OE) collision and mechanical repair information for Corvettes, as well as the other makes and models you see in your shop. OE is the gold standard when it comes to collision repair. It provides an indisputable blueprint for sectioning and working with new materials, such as ultra high strength steel, aluminum and advanced plastics. ALLDATA Collision also specifies re-initialization procedures for all those complex systems. Here are five initialization/calibration procedures for a 2009 Corvette:

I. BRAKE PEDAL POSITION SENSOR     CALIBRATION
Calibration Criteria
Important: Do not apply the brake pedal during the brake pedal position sensor calibration procedure. Any movement of the brake pedal during this procedure will cause the calibration procedure to fail. If this occurs, the brake pedal position sensor (BPPS) calibration must be repeated.

Brake pedal position sensor calibration must be performed after the brake pedal position sensor or body control module (BCM) have been serviced. The calibration procedure will set brake pedal position sensor home value. This value is used by the BCM to determine the action of the driver applying the brake system and to provide this information to the vehicle subsystems via the class 2 communication bus.

Calibration Procedure
1. Apply the parking brake.
2. Place the transmission in the PARK position for automatic transmission or NEUTRAL for manual transmission.
3. Install a scan tool.
4. Clear all BCM DTCs before proceeding.
5. Turn ON the ignition, with the engine OFF.
6. Navigate to the Vehicle Control Systems menu.
7. Select Computer/Integrating Systems menu item.
8. Select Module Setup menu item.
9. Select BCM menu item.
10. Select the BPP Sensor Calibration procedure and follow the directions displayed on the screen.

II. INFLATABLE RESTRAINT     SENSING AND DIAGNOSTIC MODULE PROGRAMMING AND SETUP

Important: The air bag indicator light may remain ON after the body control module (BCM), or sensing and diagnostic module (SDM) is replaced, and during the programming procedure for the BCM until after the procedure is completed, and the ignition key is cycled OFF and ON.
If the SDM is replaced you must setup the new SDM part number in the BCM. With a scan tool, select the SIR module setup. Select setup SDM Part Number in BCM and follow the on-screen instructions.

III. PASSENGER PRESENCE SYSTEM     REZEROING

Introduction
The Inflatable Restraints Passenger Presence System (PPS) is a calibrated system that requires rezeroing anytime the seat cushion trim attachments have been removed or the PPS has been replaced. The procedures below are designed to assist in the rezeroing of the PPS. Before you start, read these procedures carefully and completely. For further information regarding the PPS refer to SIR System Description and Operation (See: Restraint Systems\Air Bag Systems\Description and Operation).

Important: The following procedures must be followed:
1. Read this procedure carefully and completely.
2. The PPS will not function properly if the PPS rezeroing procedure is not performed.
3. Perform the Diagnostic System Check - Vehicle (See: Initial Inspection and Diagnostic Overview\Diagnostic System Check - Vehicle) after successfully completing the rezeroing procedure to ensure the system is functioning properly.

Passenger Presence System (PPS)     Rezeroing Procedure
Important: Before rezeroing the PPS, the front passenger seat must be completely empty of all items. The presence of any items on the front passenger seat will affect the calibration and operation of the PPS.
Important: When rezeroing the PPS, the instrument panel cluster (IPC) and dash lights will begin dimming ON and FF. This is normal operation during the rezeroing procedure and does not indicate additional system faults.
1. Empty the front outboard passenger seat.
2. Verify that all SIR and PPS components, connectors, and connector position assurances (CPAs) are properly connected and mounted.
3. Install a scan tool.
4. Turn ON the ignition, with the engine OFF. Important: All SIR and PPS DTCs must be cleared before rezeroing the PPS. The presence of current or history DTCs will prevent the PPS from rezeroing and may set additional DTCs.
5. Use the scan tool in order to clear the SIR and PPS DTCs.
6. With a scan tool, request the PPS rezeroing procedure.

 

7. Initiate the PPS rezeroing procedure. The PPS will illuminate both PASSENGER AIR BAG ON and OFF indicators until the rezeroing procedure has been completed.

•    When the rezeroing procedure has been successfully completed, the PPS will display the current system status by using either the PASSENGER AIR BAG ON or OFF indicator.
• If the rezeroing procedure was unsuccessful, both PASSENGER AIR BAG ON and OFF indicators will alternate from no illumination to full illumination in 1 second intervals for 5 seconds. The PPS will treat an unsuccessful rezero attempt as a system fault.
8. If the rezeroing procedure was unsuccessful, repeat this procedure. Due to the communication status between the SDM and the PPS module, this procedure may have to be repeated until a successful rezero attempt has been achieved.
9.    After the PPS has been successfully rezeroed, perform the Diagnostic System Check - Vehicle (See: Initial Inspection and Diagnostic Overview\Diagnostic System Check - Vehicle).

IV. POWER WINDOW RE-INITIALIZATION
The re-initialization of the power windows will be necessary anytime a door module has been disconnected, replaced, or the vehicles battery has been disconnected or discharged. The power window will be re-initialized when the door module learns the full up and full down positions.
To re-initialize a power window:
1. Close the door for the window being reinitialized.
2. Turn ON the ignition, with the engine OFF.
3. Run the window to the full up position and hold the switch continuously for a minimum of 0.5 seconds.
4. Run the window to the full down position and hold the switch continuously for a minimum of 0.5 seconds.

V.    TIRE PRESSURE INDICATOR SENSOR LEARN

Learn Mode Description
The Tire Pressure Monitor (TPM) System uses the keyless entry transmitter, body control module (BCM), remote control door lock receiver (RCDLR), 4 radio frequency transmitting pressure sensors, and the serial data circuit to perform the TPM learn mode functions. The sensor learn procedure must be performed after every tire rotation, RCDLR replacement, or sensor replacement. Once the learn mode has been enabled, each of the sensors unique identification codes can be learned into the RCDLRs memory. When a sensor ID has been learned, the RCDLR sends a serial data message to the BCM to sound a horn chirp. This verifies the sensor has transmitted its ID and the RCDLR has received and learned it. The RCDLR must learn the sensor IDs in the proper sequence to determine correct sensor location. The first learned ID is assigned to the left front location, the second to right front, the third to right rear and the fourth to left rear.

Sensor Functions Using J-46079
Each sensor has an internal low frequency coil. When the J-46079 Tire Pressure Monitor Diagnostic Tool is used in activate mode, it produces a low frequency transmission that activates the sensor. The sensor responds to an low frequency activation by transmitting in learn mode. When the RCDLR receives a learn mode transmission while in TPM learn mode, it will assign that sensors ID to the location on the vehicle relative to the order in which it was learned.
Learn Mode Cancellation
The learn mode will cancel if the ignition is cycled to OFF or if more than 2 minutes has elapsed for any sensor that has not been learned. If the learn mode is cancelled, the original sensor IDs will be maintained. If the learn mode is cancelled after any sensor is learned, the DIC will display dashes instead of tire pressures for the remaining unlearned sensors and the learn procedure will need to be repeated for the system to function properly.

TPM Learn Procedure
Important: Before proceeding, ensure that no other learn procedure is being performed simultaneously or that tire pressures are not being adjusted on another TPM equipped vehicle within close proximity. Stray signals from other TPM equipped vehicles just driving by can be inadvertently learned. If any random horn chirps are heard from the vehicle while performing the learn procedure, most likely a stray sensor has been learned and the procedure will need to be cancelled and repeated. Under these circumstances, performing the TPM Learn Procedure away from other vehicles would be highly recommended. In the event a particular sensor activation does not cause the horn to chirp, it may be necessary to rotate the wheel valve stem to a different position due to the sensor signal is being blocked by another component.
1. Place the electronic keyless ignition in the ACCY position.
2. Using a scan tool, initiate the TPM Learn Mode. A horn chirp will sound indicating the Learn Mode has been enabled.
3. Starting with the left front tire, hold the antenna of the J-46079 aimed upward against the tire sidewall close to the wheel rim at the valve stem location. Press and release the activate button and wait for a horn chirp.
4. After the horn chirp has sounded, repeat step 3 for the remaining 3 sensors in the following order:
•    Right front
•    Right rear
•    Left rear
5. After the LR sensor has been learned, a double horn chirp will sound indicating all sensors have been learned.
6. Place the electronic keyless ignition in the OFF position to exit the learn mode.
After the learn mode has been exited, adjust all tires to the recommended pressures.

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