C4 Keyless Entry and Alarm Repair, Part 2 - Technically Speaking

James Berry Oct 1, 2011 0 Comment(s)
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How to Run a Diagnostic Test on a 12-Pin ALDL System (Image B)
Assuming your fuses check out OK, you can run a diagnostic check using the following procedure:

Vemp 1109 02 C4 Corvette Passive Keyless Entry And Alarm 2/3

1. Connect pins A and G together on the 12-pin Assembly Line Data Link (ALDL) connector. (Note that while this diagram is labeled "F-body," the procedure is the same for Corvettes.)
2. Turn the key to the Run position, engine off. The PKE light in the Driver Information Center (DIC) will flash any existing fault codes. If no fault codes flash, it's likely that you have a faulty PKE receiver.
3. The DIC light will flash once, pause, and flash again two to seven more times to indicate the existing fault code. For example, one flash followed by a pause and then two more flashes would indicate a code 12.
4. The following is a list of Diagnostic Trouble Codes (DTC) and what they mean:
&bull 12: Receiver Memory Bad
&bull 13: Transmitter Not in Range
&bull 14: Non-Valid Transmitter Received
&bull 15: Valid Transmitter Received
&bull 16: Passenger Door Button Depressed
&bull 17: Hatch Button Depressed

How to Run a Diagnostic Test on a 16-Pin ALDL System
1. Connect pins 5 and 8 together on the 16-pin ALDL connector.
2. Turn the key to the Run position, engine off. The PKE light in the Driver Information Center (DIC) will flash any existing fault codes. If no fault codes flash, it's likely that you have a faulty PKE receiver.
3. The DIC light will flash once, pause, and flash again two to seven more times to indicate the existing fault code. For example, one flash followed by a pause and then two more flashes would indicate a code 12.
4. The following is a list of DTCs and what they mean:
• 12: Receiver Memory Bad
• 13: Transmitter Not in Range
• 14: Non-Valid Transmitter Received
• 15: Valid Transmitter Received
• 16: Passenger Door Button Depressed
• 17: Hatch Button Depressed

Notes on Fault Codes
A fault code 12 likely indicates that you have a PKE receiver with an internal failure (common).

A fault code 13 likely indicates that you have transmitter with a faulty battery (common), a faulty transmitter (common), or a faulty or unplugged antenna (uncommon).

&bull Remember that inside the key fob is a tiny gold bearing located in a small cylinder. This bearing "wakes up" the PKE receiver when movement is detected. If the bearing becomes dirty, its movement may be restricted, causing the receiver to wake up sporadically or, in severe cases, not at all.
&bull It's possible to remove the metal housing and gently clean the inside with spray contact cleaner. You'll also need to clean the ball bearing; this procedure is similar to cleaning the mouse on your home computer. Be sure to use a cleaning agent that is appropriate for electrical components.

A fault code 14 likely indicates that your transmitter isn't programmed or has a defective battery (common).

A fault code 15 likely indicates that you have a system input that isn't in a ready state. You'll need to test all of the system inputs to determine which one is at fault (see below). If no input faults are found, you most likely have a PKE receiver with an internal failure.

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