DESCRIPTION & OPERATION
| WARNING | Vehicles are equipped with air bag supplemental restraint system. Before attempting any repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in AIR BAG RESTRAINT SYSTEM article in RESTRAINTS. |
| CAUTION | When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery. |
There are two data lines that can be accessed with a scan tool. The 800 circuit is the PCM data line. It allows the PCM and Electronic Brake Control Module (EBCM) to communicate with a scan tool. The Diagnostic Energy Reserve Module (DERM) connects to the Data Link Connector on the 1061 circuit. A scan tool can be connected to the DLC, allowing the scan tool to communicate with the two data lines. System operations can then be monitored for diagnostic purposes.
COMPONENT LOCATIONS
| Component | Location |
|---|---|
| Data Link Connector (DLC) | Lower Driver Side Hush Panel. (Scheme 1) |
| Diagnostic Energy Reserve Module (DERM) | Behind Passenger Side Front Kick Panel. (Scheme 2) |
| Electronic Brake Control Module (EBCM) | Rear Of Engine Compartment At Center Dash Panel. (Scheme 3) |
| Engine Control Module (ECM) | Under Passenger Side Of Instrument Panel. (Scheme 4) |
| C207 (23 Terminals) | Driver Rear Corner Of Engine Compartment. (Scheme 4) |
| G110 (VIN M) | Driver Side Of Engine Compartment. (Scheme 5) |
| G110 (VIN 3) | Lower Driver Front Of Engine Compartment. (Scheme 5) |
| S113 | Engine Harness, Passenger Rear Of Dash Panel. (Scheme 5) |
| S217 | Instrument Panel Harness, Lower Driver Side Of Steering Column. (Scheme 6) |
| S277 | Engine Harness, Passenger Rear Of Engine Compartment. (Scheme 3) |
COMPONENT LOCATIONS
Scheme 1
Scheme 2
Scheme 3
Scheme 4
Scheme 5
Scheme 6
TROUBLE SHOOTING
- If the PCM and the EBCM are not accessible with a scan tool, check for an open in circuit 800 between DLC terminal "M" and splice S277.
- If a single component is not accessible with a scan tool, check for an open in circuit 800 between S277 and the module. If the wire is good, see appropriate «DIAGNOSTIC CIRCUIT CHECK»(/buick/skylark/vii-1992-1998/remont/testing-diagnostics/#engine-controls-basic-testing__diagnostic-circuit-check) in BASIC DIAGNOSTIC PROCEDURES in ENGINE PERFORMANCE, «DIAGNOSTIC SYSTEM CHECK»(/buick/skylark/vii-1992-1998/remont/anti-locktraction-control/#anti-lock-brake-system__diagnostic-system-check) under DIAGNOSIS in ANTI-LOCK - ABS-VI article in BRAKES or «SIR DIAGNOSTIC SYSTEM CHECK»(/buick/skylark/vii-1992-1998/remont/airbag/#air-bag-restraint-system) under DIAGNOSTIC CHARTS in «AIR BAG RESTRAINT SYSTEM»(/buick/skylark/vii-1992-1998/remont/airbag/#air-bag-restraint-system) article in RESTRAINTS.
- Visually inspect for obvious signs of mechanical and electrical damage. Inspect for blown fuses and damaged relays. Inspect for loose or corroded connections, damaged wiring harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. These circuits may be intermittent or resistive when loaded and should be checked by monitoring the voltage drop with the system under load.
- Ensure any aftermarket electronic equipment is properly installed. If fault is found, repair as necessary.
DATA LINE DIAGNOSIS
To perform diagnosis (Scheme 7)and (Scheme 8).
