F. Replacement Components of RCL
All models, model year 1996The RCL control module (N54) and engine control module (N34) (component designation varies with engine) are "married" together via an identification code. During each starting attempt, the engine control module asks the RCL control module (via the CAN bus) for its identification code. If the returned code from the RCL control module does not match the code in the engine control module's memory, the engine will not start. It is therefore impossible to swap control modules (either RCL or engine control) for troubleshooting purposes.
The RCL and engine control module identification codes cannot be changed, and this code remains with the vehicle for its service life.
The complete lock codes (both mechanical and infrared) that were originally assigned to the vehicle are noted on a label affixed to the RCL control module.
Additional Lock Code Information
Before July 14 1995, the lock number code was structured: 24975800 10390307
After July 14 1995, the lock number code was restructured to: 2497580 01039030 7
Replacement of Control Modules
If the RCL control module must be replaced for any reason, a specially programmed module for the specific vehicle must be ordered from your facing PDC. The programming code must be the same as the originally installed module.
If the engine control module must be changed for any reason, the module received as a spare part is unprogrammed and must be programmed to the RCL control module identification code. Once this is done, the engine control module is "married" to that specific vehicle and cannot be used in any other vehicle. The programming occurs automatically after a few starting attempts or can be performed manually with the Hand-Held-Tester (HHT).
Therefore, it is not advisable to install any engine control module for temporary testing or troubleshooting as it either will not contain the correct identification code (and the engine will not start) or it will become "married" to that vehicle (and cannot be used in any other vehicle).
Warranty claims for engine control modules accidentally "married" to a vehicle will be denied.
If the customer loses an IR transmitter (which includes a mechanical key):
^ Vehicle's RCL number code remains, and the lost IR transmitter (5) is de-synchronized via the RCL control module and the HHT and blocked (until key is possibly found) or irrevocably blocked (obtain vehicle owner approval) which renders the lost IR transmitter useless.
^ To maintain vehicle security, all mechanical locks should be changed, using a new mechanical lock number code. Lock changes must be reported, using the Lock Change Notice Form. See Parts Information 11651, section 3, dated April 2, 1993 for details.
If the RCL control module is defective:
^ A new RCL control module must be specially ordered for the specific vehicle, using the same RCL identification code as the previously installed RCL control module.
If a mechanical lock or key is defective:
^ Replace the defective lock (or key) with a new one, using the same mechanical lock number code (specially ordered from your facing PDC). Lock changes must be reported, using the Lock Change Notice Form. See Parts Information 11651, section 3, dated April 2, 1993 for details.
If an engine control module is defective:
^ Order a replacement module in the usual manner. Replacement modules received from spare parts are unprogrammed. The engine control module will either program itself automatically after a few engine starts or it can be programmed manually using the Hand-Held-Tester (HHT).