You can't figure out thing's without knowing how there work , what controls them . In this case a control module .
Principles of Operation
Power Door Locks
The central security module controls the power door lock and keyless entry system. The lock and unlock operation is carried out by supplying ground to the central security module from the door lock control switch. The normal path of the actuators is to ground through the central security module. The door lock control switch will lock and unlock all doors by grounding the appropriate circuit to the central security module. The central security module then supplies power to the appropriate common actuator circuit to lock or unlock all doors.
Plus we don't guess , we test the electrical circuits with a DVOM - digital multimeter or a test light . We use a wiring diagram so we know which part of the circuits to test .
Keyless Entry
The remote transmitter sends a frequency that is received by the central security module internal antenna. Depending on the frequency received, the central security module will lock all doors or unlock the driver door. If the unlock frequency is received again within five seconds of the first unlock, the central security module will unlock all doors.
If the frequency received is for the panic button, the central security module will cycle ground to the park lamp and horn. The park lamps and horn will continue to cycle until the panic button is pressed again or the ignition switch is turned to the RUN position or 2.75 minutes elapse.
Plus we hook up a scan tool that can read codes from the control module , not a code reader for engine codes , won't work ! Need a professional scan tool .Do you know what DTC'S are ? Diagnostic trouble codes !
Central Security Module Diagnostic Trouble Code (DTC) Index
DTC
Description
Source
Action to Take
B1309
Power Door Lock Circuit Short to Ground
Central Security Module
Go To Pinpoint Test C .
B1341
Power Door Unlock Circuit Short to Ground
Central Security Module
Go To Pinpoint Test C .
B1485
Brake Pedal Input Circuit Short to Battery
Central Security Module
Go To Pinpoint Test E .
B1526
Keyless Entry Circuit Short to Ground
Central Security Module
Go To Pinpoint Test F .
B1629
PRNDL Reverse Input Short to Battery
Central Security Module
Go To Pinpoint Test E .
B2276
Less Than Two Transmitters Programmed
Central Security Module
Go To Pinpoint Test I .
B2425
Remote Keyless Entry Out of Synchronization
Central Security Module
Go To Pinpoint Test I .
-
All Other DTCs
Central Security Module
REFER to Section 419-10 .
- All door locks are inoperative
- Battery junction box (BJB) fuse(s):
- 8 (15A).
- 115 (20A) (Super Crew).
- Circuitry.
- Central security module.
Seams you lack the knowledge and test equipment to tackle this type of repair . Your best bet mite be to have a qualified repair shop check it out.
So, without testing i couldn't even begin to suggest what mite be wrong . I would only be guessing , as would anyone on here would.
My ignition switch froze. It's the alarm, as the key works everything else except turning the ignition switch. I've disconnected the battery twice, changed batteries twice in the remote key. Still cannot turn the ignition switch.
i have 1995 model c180, Alarm wirh central lock. The alarm works fine. But central lock is not working and i cant start the car from the ignition.
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