Rear Wheel Antilock Brake System (RWAL)
This article has been updated with TSB 91-228-5ACCESSING AND READING ABS DIAGNOSTIC TROUBLE CODES
Trouble codes can be read with the "Tech 1" computer/scanner, (or equivalent), plugged into the Assembly Line Diagnostic Link (ALDL) connector. Follow all computer/scanner manufactures instructions.
IMPORTANT: When using the Tech 1 remember to use a scan tool with a serial number above xx002000 along with tool number TK2650 (4WAL cartridge, special RWAL 4WAL adapter, and harness).