Component Tests and General Diagnostics
When performing the following tests, refer to SCHEMATIC DIAGRAMS/ELECTRICAL AND ELECTRONIC DIAGRAMS for wiring diagram.
1. Disconnect instrument cluster connector, turn ignition switch to Run position and cruise switch to Off position and measure voltage between terminals as follows:
a. Measure between terminal D5 (orange wire) and ground.
^ If battery voltage is not available, check LCD fuse and orange wire (circuit 840) for an open.
b. Measure between terminal C7 (gray/white wire) and ground.
^ If battery voltage is not available, replace multi-function lever.
c. Place cruise switch in On position.
d. Measure between terminal C7 (gray/white wire) and ground.
^ If battery voltage is not available, check cruise fuse, cruise switch, pink/black wire (circuit 539) and gray/white wire (circuit 397) for an open.
e. Measure between terminal C12 (gray/black wire) and ground.
^ If battery voltage is not available, check TCC/cruise brake switch, cruise control clutch switch, gray/white wire (circuit 397) light blue wire (circuit 987) and/or gray/black wire (circuit 87) for an open.
f. Measure between terminal C13 (dark blue wire) and ground.
^ If there is voltage available, replace multi-function lever.
g. Depress set switch.
h. Measure between terminal C13 (dark blue wire) and ground.
^ If battery voltage is not available, check set switch and dark blue wire (circuit 84) for an open.
i. Measure between terminal C11 (dark green wire) and ground.
^ If voltage is available, replace multi-function lever.
j. Place cruise switch in Resume/Accel position.
k. Measure between terminal C11 (dark green wire) and ground.
^ If battery voltage is not available, check cruise switch and dark green wire (circuit 83) for an open.
2. If battery voltage was available in steps a, b, d, e, h and k and there was no voltage available in steps f and i, disconnect instrument cluster connector and measure resistance as follows:
a. Measure between terminal D3 (black/white wire) and ground.
^ If resistance is shown, check black/white wire (circuit 153) and black wire (circuit 150) for an open.
b. Measure between terminal D9 (light green wire) and ground.
^ If reading is not 30-55 ohms, check vacuum valve coil in cruise control servo, light green wire (circuit 402) and black wire (circuit 150).
c. Measure between terminal D8 (dark blue wire) and ground.
^ If reading is not 30-55 ohms, check vent valve coil in cruise control servo and dark blue wire (circuit 403).
d. Measure between terminals C10 (tan wire) and C14 (dark blue/white wire).
^ If reading is not 15-30 ohms, check servo position sensor, dark blue/white and light blue/black wires (circuit 399) and tan wire (circuit 398).
e. Measure between terminal C10 (tan wire) and ground.
^ If reading is not infinite, check servo position sensor and tan wire (circuit 398) for a short to ground.
3. If reading was 0 ohms in step a, 30-55 ohms in steps b and c, 15-30 ohms in step d and infinite ohms in step e, disconnect cruise control servo connector and connect fused jumper between terminal C (black wire) of servo and ground and between terminal A (dark blue wire) of servo and battery and run engine for 1 minute, then turn engine off.
a. Connect fused jumper between terminal E (light green wire) and battery.
^ If vacuum does not pull servo all the way in, proceed to step 4.
b. Remove jumper from between terminal E and battery.
^ If vacuum does not hold servo all the way in, proceed to step 4.
4. Plug vacuum release port and repeat step 3.
5. If vacuum now holds servo all the way in, repair or replace brake switch or the hose to it.
6. If test still fails, replace cruise control servo.