VEH. CHARGES WITH IGN. KEY 'ON' BUT NOT 'OFF'

SUBJECT: VEHICLE CHARGES WITH IGNITION KEY "ON" BUT NOT "OFF" (INSTALL ABS SERVICE JUMPER HARNESS)

MODELS: 1997-98 CHEVROLET S-10 ELECTRIC TRUCK

CONDITION:

SOME OWNERS MAY COMMENT ABOUT NOT BEING ABLE TO CHARGE THE VEHICLE WITH THE IGNITION KEY OFF, BUT MAY BE ABLE TO CHARGE THE VEHICLE WITH THE KEY ON.

CAUSE:

THE ANTILOCK BRAKE SYSTEM (ABS) MODULE MAY CAUSE THE VEHICLE'S COMMUNICATION SYSTEM TO MALFUNCTION.

CORRECTION:

INSTALL ABS SERVICE JUMPER HARNESS USING THE PART NUMBER LISTED BELOW. USE THE FOLLOWING SERVICE PROCEDURE.

SERVICE PROCEDURE

1. DISCONNECT THE HIGH-VOLTAGE SERVICE DISCONNECT.

2. REMOVE THE SCREWS SECURING THE ABS CONTROLLER TO THE ABS BRAKE CONTROL MODULE (1998 TRUCKS ONLY) (FIGURE 1).

3. DISCONNECT THE 10-WAY FOUR WHEEL ANTILOCK (4WAL) C1 CONNECTOR FROM THE ABS BRAKE CONTROL MODULE. REFER TO C1 CONNECTOR DESCRIPTION IN SECTION 5E1 OF THE S-10 ELECTRIC TRUCK SERVICE MANUAL. (FIGURES 1,2).

4. INSTALL THE BLACK FEMALE CONNECTOR ON THE ABS SERVICE JUMPER HARNESS TO THE ABS BRAKE CONTROL MODULE.

5. INSTALL THE BLACK MALE CONNECTOR ON THE ABS SERVICE JUMPER HARNESS TO THE 10-WAY 4WAL C1 CONNECTOR WHICH WAS DISCONNECTED IN STEP 2.

6. INSTALL THE ABS CONTROLLER TO THE ABS BRAKE CONTROL MODULE (1998 TRUCKS ONLY).

7. REMOVE THE UNDERHOOD FUSE BLOCK (1998 TRUCKS ONLY) (FIGURE 3).

8. DISCONNECT THE GRAY 5-PIN WHEEL SPEED SENSOR CONNECTOR (C111 FOR 1997, C104 FOR 1998) LOCATED BEHIND THE ABS BRAKE CONTROL MODULE ON 1997 TRUCKS (FIGURE 4), AND BETWEEN THE UNDERHOOD FUSE BLOCK AND THE FENDER ON 1998 TRUCKS (FIGURE 5). REFER TO CONNECTOR DESCRIPTIONS IN SECTION 8A-202 OF THE S-10 ELECTRIC TRUCK SERVICE MANUAL.

9. CONNECT THE GRAY 5-PIN CONNECTORS ON THE ABS SERVICE JUMPER HARNESS TO THE C111 OR C104 CONNECTORS.

10. INSTALL THE UNDERHOOD FUSE BLOCK (1998 TRUCKS ONLY) (FIGURE 3).

11. CONNECT THE HIGH-VOLTAGE SERVICE DISCONNECT.

12. TURN ON THE IGNITION KEY UNTIL THE WAIT TELLTALE GOES OUT.

13. TURN OFF THE IGNITION KEY AND VERIFY THAT THE VEHICLE WILL CHARGE WITH THE IGNITION KEY OFF.

PARTS INFORMATION:

P/N DESCRIPTION QTY 15320927 HARNESS ASM., ELEC. BRK 1 CONTROL WIRING EXT. (1997) 15320928 HARNESS ASM., ELEC. BRK 1 CONTROL WIRING EXT. (1998)

PARTS ARE EXPECTED TO BE AVAILABLE 5-4-98 FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION DESCRIPTION LABOR TIME N6035 HARNESS ASM., ABS ELEC. BRK 0.2 HR (1997) CONTROL WIRING EXTENSION - INSTALL 0.3 HR (1998)

IMPORTANT: LABOR OPERATION IS CODED TO BASE VEHICLE COVERAGE IN THE WARRANTY SYSTEM.

FIGURES: 05 ATTACHMENTS: 00

CAPTIONS: FIG 1 - C1 CONNECTOR INSTALLATION (1998) FIG 2 - C1 CONNECTOR INSTALLATION (1997) FIG 3 - UNDERHOOD FUSE BLOCK INSTALLATION (1998) FIG 4 - C111 CONNECTOR LOCATION (1997) FIG 5 - C104 CONNECTOR LOCATION (1998)

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.

COPYRIGHT 1998 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.