Beep locking doors

[Highlander]

New to me '02 TT beeps when locking.

There is an aftermarket stereo installed that was in when I purchased the car. The beep was there when I bought it.

Durametric reports the following:

49
K lead
Status: not present
Occurance Counter: 1
This fault is displayed for informational purposes, it is not an indication of a problem and no repair is needed.

60
Central locking limit position Lock not reached
Status: not present
Occurance Counter: 1
This fault is displayed for informational purposes, it is not an indication of a problem and no repair is needed.

54
Radio receiver defective
Status: not present
Occurance Counter: 2
This fault is displayed for informational purposes, it is not an indication of a problem and no repair is needed.

Any clues why I have a beep when there does not appear to be any repairable faults?

[Hilux2400]

A bleep like this normally indicates that something is open, like a glove box or trunk lid. Any faulty switches on these?

[JFP in PA]

New to me '02 TT beeps when locking.

There is an aftermarket stereo installed that was in when I purchased the car. The beep was there when I bought it.

Durametric reports the following:

49

K lead

Status: not present

Occurance Counter: 1

This fault is displayed for informational purposes, it is not an indication of a problem and no repair is needed.

60

Central locking limit position Lock not reached

Status: not present

Occurance Counter: 1

This fault is displayed for informational purposes, it is not an indication of a problem and no repair is needed.

54

Radio receiver defective

Status: not present

Occurance Counter: 2

This fault is displayed for informational purposes, it is not an indication of a problem and no repair is needed.

Any clues why I have a beep when there does not appear to be any repairable faults?

Two of the faults are related to the aftermarket audio; the factory unit has a ground on the radio chassis that is part of the alarm network and can cause faults because it is not properly connected on the aftermarket unit. This if for an 01 car, but the principal is the same, the radio removal security tab is in the lower slot on the left hand side below the AC Vent (Upper console).

[KC_Michael]

Hi JFP, Thanks for the annotated photo. I have the same beeping when locking the car and I'm encouraged I might finally get it sorted out. I may be a little slow but could you please spell out what exactly I need to do. My first guess from your picture is I need to bridge the two elements you marked (in the picture) to provide ground?? Or. . . ground wires from both of the elements you marked to another place in the general vicinity?? Thanks in advance for your help.

[JFP in PA]

Hi JFP, Thanks for the annotated photo. I have the same beeping when locking the car and I'm encouraged I might finally get it sorted out. I may be a little slow but could you please spell out what exactly I need to do. My first guess from your picture is I need to bridge the two elements you marked (in the picture) to provide ground?? Or. . . ground wires from both of the elements you marked to another place in the general vicinity?? Thanks in advance for your help.

The original radio used grounds to detect its presence in the alarm network, the aftermarket radio does not do this. You need to recreate the grounds to satisfy the alarm system that the radio is there.