Navajo 2WD V6-4.0L OHV (1992)
Cruise Control Switch: Testing and Inspection
Do not use a test lamp to perform the following tests as excessive current draw will damage electronic components inside the amplifier. Use
only a high impedance digital multi-meter.
1.
Apply brake pedal and ensure brake lights operate. If found satisfactory, proceed to step 2. If found unsatisfactory, check stop lamps circuit.
2.
Press horn pad to sound horn. If found satisfactory, proceed to step 3. If found unsatisfactory, check horn circuit.
3.
Locate 6-pin connector at speed control amplifier.
4.
With ignition Off and 6-pin connector still connected to amplifier, connect an ohmmeter between black wire and ground.
5.
Check resistance to ground to ensure amplifier is grounded. If amplifier is not grounded, repair and retest. If amplifier is properly grounded, turn
ignition to On position while making the following voltage checks:
a. Check circuit 296 (white/purple wire). If 12 volts are present, proceed to step b. If not present, check speed control fuse and 296 circuit wire
continuity.
b. Apply brake pedal and check circuit 511 (light green wire) for 12 volts. If 12 volts is not present, check continuity between stop lamp switch
and amplifier and repair as necessary. If there is continuity, replace amplifier.
c. Check circuit 151 (light blue/black wire) for approximately 7.8 volts. If 7.8 volts is not present with amplifier properly grounded and 12 volts
at circuit 296 white/purple wire verified, check for On button sticking. If 12 volts is present or a short circuit to ground on circuit 151 (light
blue/black wire) between amplifier and steering column brush assembly. If zero volts is present and both the On button and 151 wire are
functioning properly, replace amplifier and repeat test. If 7.8 volts is present, proceed to step 6.
6.
Check following voltages between circuit 151 (light blue/black wire) and amplifier ground while rotating the steering wheel with horn pad switch
depressed making the following checks:
a. No button pressed, 7.8 volts.
b. On, 12.0 volts.
c. Off, 0.0 volts.
d. Resume, 6.5 volts.
e. Accel, 4.5 volts.
f.
Coast, 1.5 volts.
7.
If values are incorrect or fluctuate, proceed to Step 8. If values are correct, horn pad switches are operating properly. Proceed to step 17.
8.
With ignition Off, disconnect the 6-pin connector from amplifier, then check following resistances between circuit 151 (light blue/black wire) and
amplifier ground with horn pad switch depressed while rotating steering wheel. Ohmmeter readings should as follows with switch positions as
indicated:
a. Off, 0-1 ohm.
b. Accel, 646-714 ohms,
c. Coast, 114-126 ohms.
d.
d Resume, 2090-2310 ohms.
9.
If values are incorrect or fluctuate, proceed to step 10. If values are correct, replace amplifier and repeat step 4.
10.
Remove steering wheel horn pad attaching screws in back cover, then disconnect electrical connectors from wheel.
11.
Connect suitable ohmmeter between circuit 151 (yellow/light brown wire) and circuit 6 (dark/blue wire) on horn pad. Depress On switch and
check for a reading of 0-1 ohms.
12.
If reading is not correct, replace switch assembly.
13.
Pull steering wheel, then check for continuity of circuit 151 (light blue/black wire) and circuit 57 (black wire) between amplifier 6-pin connector
and brush assembly.
14.
If there is no continuity, check for continuity between 3-pin brush assembly wiring connector and brushes at steering wheel, then between mating
3-pin connector and amplifier 6-pin connector. Repair or replace brush assembly as necessary.
15.
If there is continuity for both circuits, clean brush assembly and slip rings in a suitable solvent and lubricate with suitable lubricant.
16.
Install wheel and horn pad and repeat step 4.
17.
Connect a suitable ohmmeter between circuit 150 (green/white wire) and speed sensor ground circuit 563 (orange/yellow wire).
18.
If resistance is not between 180-250 ohms, check continuity between 6-pin connector at amplifier and 2-pin speed sensor connector at transmission
and repair as necessary.
19.
If resistance is correct, the speed sensor wiring is functioning properly.
