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 appropriate AIR BAG RESTRAINT SYSTEMS article. |
| 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. |
The 461 circuit data line is the PCM data line. It allows the PCM, Variable Effort Steering (VES) control module (optional on Cutlass Ciera) and Electronic Brake Control Module (EBCM) to communicate by transmitting data. A scan tool can be connected to the DLC, allowing the scan tool to communicate with the PCM data line. System operations can then be monitored for diagnostic purposes.
COMPONENT LOCATIONS
| Component | Location |
|---|---|
| Data Link Connector (DLC) | Below Driver Side Of Instrument Panel, Near Steering Column. (Scheme 1) |
| Diagnostic Energy Reserve Module (DERM) | Behind HVAC Control Head. (Scheme 1) |
| Electronic Brake Control Module (EBCM) | Upper Passenger Side Front Of Instrument Panel, Above PCM. (Scheme 2) |
| Instrument Cluster | Driver Side Of Instrument Panel |
| Powertrain Control Module (PCM) | Behind Passenger Side Of Instrument Panel. (Scheme 2) |
| Variable Effort Steering (VES) Control Module | Driver Side Of Instrument Panel, On DERM Bracket. (Scheme 3) |
| C121 | Instrument Panel Harness, Behind Center Of Instrument Panel Near C210. (Scheme 2) |
| C210 | Behind Passenger Side Of Instrument Panel, Below PCM. (Scheme 4) |
| G105 (L4 VIN 4) | Transaxle Stud, Under Intake Manifold. (Scheme 5) |
| G105 (V6 VIN M) | Transaxle Stud, Under Intake Manifold. (Scheme 5) |
| P102 | Front Of Instrument Panel, Passenger Side |
| S137 (L4 VIN 4) | Engine Harness, Top Rear Of Engine. (Scheme 5) |
| S215 | Instrument Panel Harness, Behind Center Of Instrument Panel. (Scheme 1) |
| S296 | Instrument Panel Harness, Near DERM |
COMPONENT LOCATIONS
Scheme 1
Scheme 2
Scheme 3
Scheme 4
Scheme 5
Scheme 6
TROUBLE SHOOTING
- If all components are not accessible with a scan tool, check for an open in circuit 461 between DLC terminal M and S215.
- If a single component is not accessible with a scan tool, check for an open in circuit 461 between S215 and the component. If the wire is good, see appropriate ENGINE PERFORMANCE, ANTI-LOCK BRAKES, AIRBAG or HVAC article.
- 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.
Scheme 7
SERIAL DATA LINE DIAGNOSIS
Refer to flowchart. (Scheme 8)and (Scheme 9).
