MODEL IDENTIFICATION
| Make | Model |
|---|---|
| Chevrolet | Cutaway G3500 |
| Chevrolet | Chevy Van |
| Chevrolet | Chevy Express |
| Chevrolet | RV Cutaway |
| GMC | Savana |
| GMC | Savana Camper Special |
| GMC | Savana Special |
MODEL IDENTIFICATION
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. |
| 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. |
A scan tool can be connected to the Data Link Connector (DLC), allowing the scan tool to communicate with the various modules on board the vehicle. The Purple 1807 circuit wire allows Class 2 communication between the modules and with the scan tool. The Tan/White 799 circuit and the Tan 800 circuit allow UART communication with a scan tool. The Black/White 1455 circuit wire allows the scan tool to program the Remote Door Lock Receiver.
COMPONENT LOCATIONS
| Component | Location |
|---|---|
| Convenience Center | Under Driver Side Of Instrument Panel. (Scheme 1) |
| Data Link Connector (DLC) | Under Driver Side Of Instrument Panel. (Scheme 2) |
| Electronic Brake Control Module (EBCM) | Driver Side Frame Rail Near Center Of Vehicle. (Scheme 3)& (Scheme 4) |
| Inflatable Restraint Sensing & Diagnostic Module (SDM) | Under Driver Front Seat. (Scheme 5) |
| Instrument Panel Fuse Block | Behind Driver Lower Kick Panel. (Scheme 6) |
| Instrument Cluster | Driver Side Of Instrument Panel |
| Powertrain Control Module (PCM) | Behind Center Of Instrument Panel. (Scheme 7) |
| Remote Control Door Lock Receiver (RCDLR) | Behind Upper Passenger Kick Panel. (Scheme 8) |
| Vehicle Control Module (VCM) | Driver Side Of Engine Compartment, Near Fender. (Scheme 9)& (Scheme 10) |
| C100 | Driver Rear Of Engine Compartment At Bulkhead. (Scheme 6)& (Scheme 10) |
| C210 | Cross Body Harness Under Driver Side Of Instrument Panel, Near Brake Pedal. (Scheme 1) |
| G101 (L29) | Engine Harness, Near Thermostat Housing. (Scheme 11) |
| G101 (L65) | Engine Harness, At Generator Bracket (Scheme 12) |
| G201 | Instrument Panel Harness, Behind Driver Side Kick Panel Near Instrument Panel Fuse Block. (Scheme 6) |
| P101 | Under Passenger Side Of Instrument Panel. (Scheme 7) |
| S102 (L29) | Engine Harness, Near MAF Sensor Breakout Towards C100 Breakout |
| S102 (L30 & L31) | Engine Harness, Near ECT Sensor Breakout Towards C100 |
| S102 (L35) | Engine Harness, Near EGR Sensor Breakout Towards C100 |
| S102 (L65) | Engine Harness, Near Main Harness Breakout That Leads To Blower, Towards C100 Breakout |
| S112 | Instrument Panel Harness, Near C100 Towards P102 |
| S116 (L65) | Engine Harness, Near Main Harness Breakout That Leads To Underhood Fuse/Relay Center & C100 Breakouts, Opposite Optical Fuel Temperature Sensor |
| S153 (L29) | Engine Harness, Near C100 Breakout Towards EGR Sensor Breakout |
| S153 (L30 & L31) | Engine Harness, Near Fuel Injector Breakout Towards Transmission |
| S153 (L35) | Engine Harness, Near G103 Breakout Towards Transmission |
| S201 | Instrument Panel Harness, Near Parking Brake Warning Switch Breakout Toward DLC |
| S207 | Instrument Panel Harness, On VSS Buffer Breakout |
| S218 | Instrument Panel Harness, Near C100 Towards Instrument Panel Fuse Block |
COMPONENT LOCATIONS
Scheme 1
Scheme 2
Scheme 3
Scheme 4
Scheme 5
Scheme 6
Scheme 7
Scheme 8
Scheme 9
Scheme 10
Scheme 11
Scheme 12
PRELIMINARY INSPECTION
- Ensure scan tool is operating properly by testing scan tool on a known good vehicle.
- Inspect power auxiliary fuse No. 7. See «FUSES & CIRCUIT BREAKERS - G-VAN»(/chevrolet/chevy-van-g1500/1996-1998/remont/fuses-circuit-breakers/#fuses-circuit-breakers) article in ELECTRICAL. If fuse is open, repair short and replace fuse.
- Ensure grounds G101 and G201 are clean and tight. See «COMPONENT LOCATIONS»(/chevrolet/chevy-van-g1500/1996-1998/remont/communication-devices/#data-link-communications-system__component-locations) .
- Ensure scan tool is properly connected to the DLC.
- 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.
SCAN TOOL WILL NOT COMMUNICATE
Refer to flowchart. (Scheme 13)- (Scheme 15).
Scheme 13
Scheme 14
Scheme 15
UNABLE TO PROGRAM REMOTE CONTROL DOOR LOCK RECEIVER
Refer to flowchart. (Scheme 16)
