Chevrolet Silverado / GMC Sierra. Manual - part 722
Control Module References for EBCM or IPC replacement, setup, and programming
TRACTION OFF INDICATOR MALFUNCTION
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Circuit/System Description
The Low Traction indicator is controlled by the instrument cluster via serial data messages from
the electronic brake control module (EBCM). When the traction control system (TCS) is active
for 0.5 seconds, the EBCM commands the instrument cluster to flash the Low Traction indicator.
The electronic brake control module (EBCM) sends a serial data message to the instrument panel
cluster (IPC) to illuminate the Traction Control indicator when the EBCM has disabled the
traction control system (TCS) due to a DTC. The Traction Control indicator will also turn ON
during the instrument cluster bulb check. When the ignition switch is turned to ON, the Traction
Control indicator will turn ON for approximately 3 seconds and then turn OFF.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation (With JL4) or ABS Description and Operation (Without
JL4)
Electrical Information Reference
Circuit Testing
Connector Repairs
2008 Chevrolet Silverado 1500
2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References for EBCM and IPC
Circuit/System Verification
1. Turn OFF the ignition for 5 seconds.
2. Turn ON the ignition, with a scan tool, select instrument panel special functions Display
Test. Command the instrument panel lamps ON. Verify the traction control off lamp
illuminates for at least 2 seconds and then turns off.
Circuit/System Testing
1. Ignition OFF for 5 seconds, Igniton ON, observe that the traction off indicator functions by
illuminating for 2 seconds then turns OFF.
If the traction OFF indicator does not illuminate, with the scan tool, select instrument
panel special functions Display Test. Command the instrument panel lamps ON and
OFF. Verify the TC lamp turns ON and OFF.
If the TC warning lamp does not turn OFF, replace the IPC.
If the TC warning lamp does turn OFF, replace the EBCM.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM or IPC replacement, setup, and programming
Repair Validation
Ignition OFF for 5 seconds, Igniton ON, observe that the traction control off indicator functions
by illuminating for 2 seconds then turns OFF.This is the bulb self test that operates upon every
ignition key start cycle.
IMPORTANT: Diagnose all vehicle DTCs before using this diagnostic.
The malfunction must be present during diagnosis in order to
prevent unnecessary parts replacement.
2008 Chevrolet Silverado 1500
2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
REPAIR INSTRUCTIONS
ANTILOCK BRAKE SYSTEM AUTOMATED BLEED PROCEDURE (WITH JL4)
1. Install a scan tool to the vehicle.
2. Start the engine and allow the engine to idle.
3. Using the scan tool, begin the automated bleed procedure.
4. Follow the instructions on the scan tool to complete the automated bleed procedure. Apply
the brake pedal when instructed by the scan tool.
5. Turn the ignition OFF.
6. Remove the scan tool from the vehicle.
7. Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme 11®,
GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean,
sealed brake fluid container.
8. Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding (Pressure)
or Hydraulic Brake System Bleeding (Manual) .
9. With the ignition OFF, apply the brakes 3-5 times, or until the brake pedal becomes firm, in
order to deplete the brake booster power reserve.
10. Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
11. If the brake pedal feels spongy, repeat the automated bleeding procedure. If the brake pedal
NOTE:
When adding fluid to the brake master cylinder reservoir, use only
Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or
equivalent DOT-3 brake fluid from a clean, sealed brake fluid
container. The use of any type of fluid other than the recommended
type of brake fluid, may cause contamination which could result in
damage to the internal rubber seals and/or rubber linings of
hydraulic brake system components.
NOTE:
Refer to BRAKE FLUID EFFECTS ON PAINT AND ELECTRICAL
COMPONENTS NOTICE .
IMPORTANT: The base hydraulic brake system must be bled before performing
this automated bleeding procedure. If you have not yet performed
the base hydraulic brake system bleeding procedure, refer to
Hydraulic Brake System Bleeding (Pressure) or Hydraulic Brake
System Bleeding (Manual) before proceeding.
2008 Chevrolet Silverado 1500
2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
still feels spongy after repeating the automated bleeding procedure inspect the brake system
for external leaks. Refer to Brake System External Leak Inspection .
12. Turn the ignition key ON, with the engine OFF; check to see if the brake system warning
lamp remains illuminated.
13. If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be
driven until it is diagnosed and repaired. Refer to Symptoms - Hydraulic Brakes .
14. Drive the vehicle to exceed 13 km/h (8 mph) to allow ABS initialization to occur. Observe
brake pedal feel.
15. If the brake pedal feels spongy, repeat the automated bleeding procedure until a firm brake
pedal is obtained.
ANTILOCK BRAKE SYSTEM AUTOMATED BLEED PROCEDURE (WITHOUT JL4)
1. Install a scan tool to the vehicle.
2. Start the engine and allow the engine to idle.
3. Depress the brake pedal firmly and maintain steady pressure on the pedal.
NOTE:
When adding fluid to the brake master cylinder reservoir, use only
Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or
equivalent DOT-3 brake fluid from a clean, sealed brake fluid
container. The use of any type of fluid other than the recommended
type of brake fluid, may cause contamination which could result in
damage to the internal rubber seals and/or rubber linings of
hydraulic brake system components.
NOTE:
Refer to BRAKE FLUID EFFECTS ON PAINT AND ELECTRICAL
COMPONENTS NOTICE .
IMPORTANT: This procedure may be performed on all vehicles EXCEPT those
equipped with option code JL4, Vehicle Stability Enhancement
System (VSES).
IMPORTANT: The base hydraulic brake system must be bled before performing
this automated bleeding procedure. If you have not yet performed
the base hydraulic brake system bleeding procedure, refer to
Hydraulic Brake System Bleeding (Pressure) or Hydraulic Brake
System Bleeding (Manual) before proceeding.
2008 Chevrolet Silverado 1500
2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado