SERVICE MANUAL UPDATE SEC. 5E1 REVISED ABS/ASR SYMPTOM TABLE

SUBJECT: SMU - SECTION 5E1 - REVISED ABS/ASR SYMPTOM TABLE

VEHICLES AFFECTED: 1992 "Y" MODEL CHEVROLET CORVETTE

SERVICE MANUAL UPDATE SECTION 5E1 - - - - - - - - - - -

The "ABS/ASR Symptom Table" for the 1992 Corvette Section 5E1 has been revised to include all ABS/ASR indicators coming "ON" when the ignition is turned "ON," but not turning "OFF" after a few seconds, as they should when the bulb check sequence is complete. Please use the new "ABS/ASR Symptom Table" for all 1992 Corvette ABS/ASR diagnosis.

ABS/ASR SYMPTOM TABLE --------------------- CHART SYMPTOM PAGE # ----- ------- ------ A "SERVICE ABS" INDICATOR "ON" WITH NO CODES SET 26 B "SERVICE ABS" INDICATOR INOPERATIVE OR FLICKERS 28 BRIEFLY AT IGNITION "ON" C "SERVICE ASR" INDICATOR "ON" WITH NO CODES SET 30 D "SERVICE ASR" INDICATOR INOPERATIVE 32 E "ABS ACTIVE" INDICATOR ALWAYS "ON" 34 F "ABS ACTIVE" INDICATOR INOPERATIVE 36 G "ASR ACTIVE" INDICATOR "ON" WITH NO CODES SET 38 H "ASR ACTIVE" INDICATOR INOPERATIVE WITH NO CODES SET 40 I "ASR OFF" INDICATOR ALWAYS "ON" 42 J "ASR OFF" INDICATOR INOPERATIVE 44 "BRAKE" WARNING LAMP "ON" SECTION 5 "BRAKE" WARNING LAMP INOPERATIVE SECTION 8A-41 ALL ABS AND ASR INDICATORS INOPERATIVE SEE "A" BELOW ALL ABS AND ASR INDICATORS ALWAYS "ON" SEE "B" BELOW ALL ABS AND ASR INDICATORS FLASH REPEATEDLY SEE "C" BELOW

A) When the "SERVICE ABS," "SERVICE ASR," "ABS ACTIVE," "ASR ACTIVE," and "ASR OFF" indicators are all inoperative, inspect CLSTR fuse.

- If fuse is good, check for voltage availability to the fuse, an open in circuit 139 between CLSTR fuse and the Driver Information Center (DIC) terminals "D" and "E" on the brown DIC harness connector, and proper terminal contact integrity at these terminals. Refer to "Intermittents and Poor Connections" in SECTION 8A-4.

- If fuse is open check for a short to ground in circuit 139, refer to SECTION 8A-11. If no short is found replace CLSTR fuse and repeat "ABS/ASR Functional Check."

- If no trouble is found with the preceding tests, service the DIC printed circuit.

B) When the "SERVICE ABS," "SERVICE ASR," "ABS ACTIVE," "ASR ACTIVE," and "ASR OFF" indicators all come "ON" when the ignition is turned "ON" but do not turn "OFF," after a few seconds (bulb check), check for a poor connection or an open in ground CKT 801, especially at the connection point to the engine. Also refer to Code 65 diagnostics if a Code 65 is present along with this condition.

C) When the "SERVICE ABS," "SERVICE ASR," "ABS ACTIVE," "ASR ACTIVE," and "ASR OFF" indicators all flash "ON" and "OFF" repeatedly, repair an intermittent open in CKT 439. Refer to "Intermittents and Poor Connections" in SECTION 8A-4 to help locate the intermittent.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.