TESTING
(WITHOUT DRB-II)
Brakelight Switch
Disconnect brakelight switch 6-pin connector. Using an
ohmmeter, check for continuity at switch side of connector terminals.
See the TESTING BRAKELIGHT SWITCH table. If continuity is not as
specified, check brakelight switch adjustment. If switch adjustment is
okay, replace defective brakelight switch.
TESTING BRAKELIGHT SWITCH TABLE
Pedal Position/Test Terminals Continuity
Released
1 & 4 .............................................. Yes
3 & 6 .............................................. Yes
2 & 5 ............................................... No
Depressed
1 & 4 ............................................... No
3 & 6 ............................................... No
2 & 5 .............................................. Yes
NOTE: For connector terminal identification, refer to the
CONNECTOR IDENTIFICATION table. For appropriate
wiring diagram, see appropriate chassis wiring diagram
in the WIRING DIAGRAMS section.
CRUISE CONTROL CIRCUIT
1) Disconnect Powertrain Control Module (PCM) connector. On
XJ models, PCM is located on drivers side fender. On ZJ models, PCM is
located on passenger side firewall. Using external voltmeter, connect
negative lead to vehicle ground.
2) Turn ignition on. Check voltage at terminal No. 33.
Voltage should be zero volts with cruise control switch in OFF
position. Voltage should be battery voltage with switch in ON
position. Repair harness as necessary if voltage is not correct.
3) Check voltage at terminal No. 53. Voltage should be zero
volts with cruise control switch in OFF position. Voltage should be
battery voltage with switch in ON position. Repair harness as
necessary if voltage is not correct.
4) Check voltage at terminal No. 48. Voltage should be zero
volts with cruise control switch off. Voltage should be battery
voltage with switch on. With switch in ON position, voltage should
drop to zero volts when SET button is pressed. Repair harness as
necessary if voltage is not correct.
5) Check voltage at terminal No. 50. Voltage should be zero
volts with cruise control switch in ON or OFF position. With cruise
control switch in SET or RESUME position, voltage should be battery
voltage. Repair harness as necessary if voltage is not correct.
6) Check voltage at terminal No. 49. Voltage should be zero
volts with cruise control switch off. Voltage should be battery
voltage with switch on. With cruise control switch in SET or RESUME
position, voltage should be battery voltage. Repair harness as
necessary if voltage is not correct.
7) Using external ohmmeter, check resistance between terminal
No. 29 of PCM connector and vehicle ground. Pressing brake pedal,
ohmmeter should display continuity with pedal released. With brake
pedal depressed, ohmmeter should display open circuit.
CRUISE CONTROL SERVO TEST
1) Turn ignition on. Place cruise control switch in ON
position. Using external voltmeter, connect negative lead to vehicle
ground. Disconnect servo connector. Check voltage at pin No. 2 (Dark
Blue/Red wire) of servo connector. If voltage is less than battery
voltage, check for loose connections, brake switch adjustment or
damaged harness.
2) Connect a jumper wire between terminal No. 2 (Dark
Blue/Red wire) of servo connector and corresponding terminal of servo.
Check voltage at 3 remaining male servo terminals. If voltage is less
than battery voltage at each terminal, replace servo.
3) Using external ohmmeter, measure resistance between
terminal No. 1 of servo connector and vehicle ground. If resistance is
more than 5 ohms, check and repair harness as needed.
this is what the FSM says to do, so i guess ill get a helper and start in on that
