REAR ANTILOCK BRAKE SVSI'EM TROUBLESHOOTING CHART YELLOW RABS BULB DOES NOT LIGHT GO TO TEST A TNO CHECK: t MODULE HARNESS CTRO 0 MODULE GROUND 0 ANTILOCK LIGHT POWER .15 AMP WARNING FUSE 0 POWER TO 155 AEMP WARNINGF I ANTILOCK BULB A WIRING FLASHING ON AND OFF GO TO TEST E TO CHECK: I INTERMITTENT POWER TO MODULE I GROUNDED DIAGNOSTIC LEAD I FAULTY MODULE GROUND GO TO TEST C TOl CHECK: - LOW BRAKE FLUI ~ MASTER CYLINDER FLOAT - DIODE/RESISTOR ELEMENT -ANTILOCK VALVE SWITCH - MASTER CVLINDER SWITCH ~ BRAKE LIGHT WIRING GO TO TEST DZ TO CHECK: 0 MASTER CYLINDER HARNESS CONNECTOR RABS 20 AMP FUSE C SHORTS IN MODLIILEG HARNESS CONNECTOR WIR l POWER TO MODU I VOLTIBGE AT FLUIDE LEVEL SEN o GROUNDED DIAGNOSTIC LEAD NOTE THE REAR ANTILOCK' BULB vBE REPEATED HERE HTS' ION @R EFER To 'oBTAININe THE FLASHDUT cons" IN THIS SECTION IF VEHICLE IS ON" AND RABS LIGHT IS ON OBTAIN FLASHOUT CODE BEFORE SHUTTING ENGINE OFF. THEN CONTINUE AS FOLLOWS: TURN IGNITION SW FROM OFF" TO RUN" OBSERVE 2 SECOND REAR ANTILOCK BULB TEsT G) YELLOW RABS BULB LIGHTS TURN IGNITION SW FROM "RUN" TO "START RED BRAKE BULB DOES NOT LIGHT RED BRAKE BULB LIGHTS OBSERVE "REAR ANTILOCK" OBSERVE LIGHT (WAIT AT "BRAKE" LIGHT ST 20 GO TO TEST F To CHECK: O VEHICLE STOP LIGHT CIRCUIT OBSERVE "BRAKE" LIGHT APPLY SERVICE BRAKES Go To TEST G TO CHECK o MASTER chINDER CONNECTOR 0 RED BRAKE WARNING . LIG o VOLTAGE AT FLUID LEVEL CIRCUIT - FLUID LEVEL SENSOR AND WIRING GO TO TEST B TO CHECK: o PARKING BRAKE O PARKING BRAKE WITCH O DIESEL LOW VACUUM SWITCH o MODULEA WIRING so To TEST D TO OBTAIN FLASH OUT CODE g: OBSERVE FLASHOUT CODE VEHICLE ROAD TEST, AT Io MPH APPLY BRAKES TO LOCK ALL A WHEELS VALID CODE FLASHING Go To FLASHOUT CODE TEST INDICATE REAR WHEELS DONT LOCK THE SYSTEM IS NOW FUNCE TIONING OK. CONSIDER A POSSIBLE INTERMITTENT WIRING PROBLEM 0R POSSIBLVA PROBLEM WHICH ONLV SHOWS UP DURING DRIVING. REFER TO FLASHOUT CODE 6 FOR POSSIBLE AREAS OF CONCERN. NOT LIT FIX VEHICLE STOP LIGHT CIRCUIT REAR WHEELS LOCK CONTINUE WITH TEST F3 TO CHEK o WIRING FROM MODULE A o MECHANICAL PROBLEMS IN REAR BRAKES I COMPUTER MODULE CHusTn