Ranger 2WD V6-182 3.0L (1995)
Keyless Entry: Pinpoint Tests
Test Notes
Door Lock Motors/Switches Inoperative
The door locks are wired so that the lock and unlock switches on the doors/liftgate can operate the door locks with or without a receiver assembly
installed in the system. The door lock switches are wired directly to the relays that control the door locks.
When the receiver assembly operates the door locks, it provides a ground just like the door lock switches. Both the GEM and receiver assembly operate
the door unlock relays.
(GEM performs the two-key-turn unlock. Refer to Section 18-04A .) If the receiver assembly and GEM are both disconnected and the door locks still
don't work, there is a switch, motor, lock mechanism, fuse or
wiring issue.
The receiver assembly uses the LOCK ALL and UNLOCK ALL Circuits 119 and 120 as outputs, but also monitors these circuits as inputs to see when
the door lock switches are pressed.
Pressing the UNLOCK switch on the door can unlock all doors. It unlocks the driver's door by supplying power to the driver's door lock motor through
the normally closed contacts of the driver's door unlock relay.
NOTE: If state is SHORT, check and service Circuits 120 (PK/LG) and 119 (PK/Y) for short to ground or each other.
A: Door Lock Motors/Switches Inoperative
A: DOOR LOCK MOTORS/SWITCHES INOPERATIVE
A1 CHECK MECHANICAL OPERATION OF LOCKS
-
Manually (not electrically) cycle the lock by turning the key in the door.
Do the door lock mechanisms move freely?
Yes
GO to A2
No
SERVICE the door lock mechanisms (LUBRICATE linkage, CLEAR interferences, etc.).ces, etc.)
A2 DOOR LOCKS DON'T WORK WITH LOCK SWITCHES ON THE DOORS
-
Check the fuses for the door lock motors.
Are the fuses OK?
Yes
GO to A3
No
LOCATE the wiring short in the door lock power circuits. REPLACE fuse.
A3 CHECK STATUS OF DOOR LOCK SWITCHES
-
Enter in NGS: RAP, PID/DATA and select DRLK SW to monitor the door lock and unlock switches.
NOTE: Some vehicles may have power door locks, but may not have a receiver assembly system. If there is no receiver assembly, tests are limited to
voltage and resistance measuring.
Is NGS DRLK SW state OFF?
Yes
GO to A4
No
If the display says UNLOCK, CHECK and SERVICE the all unlock Circuit 120 (PK/LG), door unlock switches or GEM module for a short to
ground. If the display says LOCK, CHECK and SERVICE the all lock Circuit 119 (PK/Y) or door lock switches for a short to ground. If the doors
lock and then unlock about once every five seconds after ignition is turned from OFF to RUN and back to OFF, CHECK the audio system. If the
rear control unit (RCU) of the audio system has a connector unplugged or a loose ground, then the audio system will not work. Another side effect
is that there is a floating voltage on the ignition Circuit 1002 (BK/PK) to the receiver assembly. The receiver assembly is being put into transmitter
programming mode every few seconds. Fixing the audio RCU ground will fix this lock/unlock condition too.
A4 CHECK OPERATION OF DOOR LOCK SWITCHES
-
Press LOCK button on each door lock switch and confirm that NGS, RAP DRLK SW state changes to LOCK when switches are pressed.
-
Press UNLOCK button on each door lock switch and confirm that NGS, RAP DRLK SW state changes to UNLOCK when switches are pressed.
Does LOCK and UNLOCK state for each door lock switch occur?
Yes
GO to A5
No
-
If UNLOCK state doesn't occur, CHECK and SERVICE the all unlock Circuit 120 (PK/LG) or door unlock switches for an open, or