Retrieving Codes

To retrieve stored RWAL trouble codes, perform RWAL SYSTEM CHECK. See Fig 1 - Fig 3 . The 10-pin diagnostic connector is located under dash, behind RWAL EBCM. See Fig 4 . Stored trouble codes are flashed by BRAKE warning light. See RWAL TROUBLE CODE IDENTIFICATION table. See RWAL TROUBLE CODES for testing procedures. If more than one fault is present, lowest number code will flash repeatedly until it is repaired and cleared from memory. Last flash of indicated code will last longer than others, indicating code is about to repeat.

Fig 1: RWAL System Check (1 Of 3)

Courtesy of GENERAL MOTORS CORP.

Fig 2: RWAL System Check (2 Of 3)

Courtesy of GENERAL MOTORS CORP.

Fig 3: RWAL System Check (3 Of 3)

Courtesy of GENERAL MOTORS CORP.

RWAL TROUBLE CODE IDENTIFICATION

Code	Condition/Circuit
2	Open Isolation Solenoid Circuit
3	Open Dump Solenoid Circuit
4	Limit Valve Reset Switch Closed
5	Excessive Dump Valve Action
6	Wheel Speed Sensor Signal Changed Rapidly
7	Shorted Isolation Solenoid Circuit
8	Shorted Dump Solenoid Circuit
9	Open Wheel Speed Sensor Circuit
10	Stoplight Switch On Constantly
11	Shorted Wheel Speed Sensor
13	RWAL EBCM Malfunction

Fig 4: Identifying Diagnostic Connector Location & Terminals

Courtesy of GENERAL MOTORS CORP.