Key Fob Test - kw accessory battery body control crank dash DIC display door electrical entry failure FOB ignition indicator intermittent IPC keyless LH2 memory module operation panel performance

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

The XLR uses a unique entry system called the KEYLESS ACCESS SYSTEM. If the Driver Information Center (DIC) reads NO FOBS DETECTED the following test may be of some assistance in diagnosis.

First - make sure the concern does not happen in one particular area only, such as within the shop. If this is found to be the case, this may be normal Radio Frequency Interference (RFI) and is considered a normal condition.

Second - To check the Customer Interface Device or CID (formally known as the "Key fobs"), put the key fob on the J-43241 tester and then walk up to a locked vehicle. The key fob tester can be used for the normal functions of the CIDs, such as pressing the lock, unlock, and the trunk buttons. If you push the trunk or door soft key on the CID the J-43241 tester should beep (within 100 feet of the vehicle).

The CID should open the door in the passive mode (no button press) when it is three feet away from the door handle switch. If the CID cannot unlock the vehicle until it is as close as 18 inches away from the door handle switch, the CIDs have a range concern and should be replaced. The J-43241 tester should beep when the CID is polled by the Remote Control Door Lock Receiver (RCDLR) when using the passive mode. Note: The KEYLESS ACCESS SYSTEM cannot be personalized to unlock both doors at the same time, when entering the vehicle using the passive method. The system will however unlock both the driver door and the passenger side door if the vehicle is approached from the passenger side instead of the driver door with the CID. With a CID within the vehicle, use the ignition switch to start the vehicle. The tester should also beep when using the start, off, or crank command. Again, this is due to the vehicle KEYLESS ACCESS SYSTEM antennas polling the CID.

Third - By reviewing the Tech 2 data, it can be determined which of the CIDs the vehicle is receiving a signal from. The Tech 2 will show the Driver number change from one to two etc. when the CIDs are used manually or with the KEYLESS ACCESS SYSTEM passively/automatically.

Note: The number on the back of the CID may not correspond with the vehicle display/Tech 2. The sequence in which the CIDs were programmed initially determines the order displayed by either the vehicle or the Tech 2. Due to the KEYLESS ACCESS SYSTEM being passive/automatic, if two CIDs are present within range of the RCDLR, the lower number CID will be used by the vehicle in all circumstances to determine memory settings etc.

The CID is "erased" or "invalidated" when another CID is programmed over top the previously programmed CID. A CID that is erased/invalidated can be relearned to the same RCDLR. A CID that is learned on one vehicle can't be learned on another vehicle however.

Fourth - You can identify a CID that has been checked for a low range concern by looking at the rear face for the following markings: It's very subtle, but on the first line of text on the back of the CIDs, it reads (for CID 1): GM/X: 10347463 = suspect CID designation. The CIDs that have been through a testing process now in place will be marked as follows: (for CID 1): GM/S: 10347463 with the "S" being the only designator. Other than this "S" designation, the CIDs are identical. CID #2 is done the same way, but the part number is 10347464. Replace the CIDs in pairs if one is found to have a range concern. For all other conditions the CIDs can be replaced one at a time.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

(04 Cadillac XLR)

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