IDENTIFICATION
| 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. |
| CAUTION | Vehicles equipped with coded radios are susceptible to damage when battery is disconnected. Ensure ignition switch is in OFF position and radio is turned off before disconnecting battery. Have radio code available when disconnecting battery or removing radio. |
Note. For Mercedes-Benz model, chassis and engine identification, see MERCEDES-BENZ MODEL IDENTIFICATION .
Version Coding W/HHT Starting 03/94 (Up To HHT Diagnosis Identification 45)
Note. If returning a new control module to a PDC, the code number must be reused.
- Before replacement of the engine control module, the existing code number must be read and stored with the HHT (menu selection 6 "Version Coding"). After installation of the new control module, the previously read code number must be entered.
- If the code number can NOT be read, the vehicle equipment/version must be determined, the corresponding code number obtained and manually entered with the HHT.
- When performing a trial installation of a control module with the same part number from another vehicle (up to model year 1995), but with a different code number, the following must be observed: Read and record code number from vehicle with complaint. Exchange control modules. Read and record code number from the exchanged control module. Enter the code number from the original control module into the exchange control module. Perform function test. Before returning control module to other vehicle, enter recorded code number into exchange control module. Exchange control modules.
- Drive Authorization System, Stage 2, 2B, 3 (DAS) Upon replacement the engine control module must be version coded using the HHT. Additionally, the code number and VIN must be entered.
See also:
• MERCEDES-BENZ MODEL IDENTIFICATION