My wife's 95 Lumina had the same type of key and the chip wore out form time to time causing problems. The solution could be as simple as replacing the key. But with the POS Lumina we had required us to replace both the key and the switch.
Here is a diagnostic I found that may be useful:Fault Finding
Although the red LED is used for the alarm and the PATS system, PATS has priority, and the LED can be used for fault diagnosis. The LED should always go out about three seconds after ignition on.
If there are less than three keys programmed into the PATS module the LED will stay on for one minute with the engine running, but if the LED flashes after that then careful attention should be paid because it may be a fault code.The following checks can be made without special tools:
|The engine does not start and LED remains off.||1. Check PATS system fuses |
|2. If alarm is fitted check if LED functions for alarm: if not check cigar lighter fuse (also used for LED) |
|Engine does not start: LED flashes rapidly ||Leave ignition on until the LED starts to flash a 2 digit code: (sequence- pause-sequence) Check the following codes:|
|Code flashes:|| |
|1:3 ||Key code not received. Is key screened by other keys or objects? Try different key: if okay then first key is faulty. |
|1:4 ||Partial code only received. Try again. If not okay use different key.|
|1:5 ||Key not programmed into PATS. Program key as above using master |
|1:6 ||Faulty link between PATS module and EECV|
If the LED illuminates for 4 seconds but the engine does not crank, PATS is working correctly and there is a fault elsewhere. Try starter solenoid or battery.
If the LED illuminates for 4 seconds and the engine cranks but does not start, PATS is working correctly and the fault lies elsewhere. Check the Fuel Cut-Off switch.
If the above does not plan out you need to have the tech run the special tool (WDS)...