Cruise Control Will Not Engage

Turn ignition off. Disconnect cruise control module connector. Turn ignition on (engine off). Connect test light between connector terminal "F" (Pink wire) and ground. See Figure . If test light glows, go to next step. If test light does not glow, go to step 16).
Connect test light between cruise control module connector terminals "F" (Pink wire) and "E" (Black wire). If test light glows, go to next step. If test light does not glow, go to step 17).
Turn cruise control on. Connect test light between cruise control module connector terminals "A" (Gray wire) and "E" (Black wire). If test light glows, go to next step. If test light does not glow, go to step 18).
Connect test light between cruise control module connectors "B" (Dark Blue wire) and "E" (Black wire). While observing test light, press and hold SET/COAST switch. If test light glows, go to next step. If test light does not.
Connect test light between cruise connector terminals "C" (Gray/Black wire) and "E" (Black wire). If test light does not glow, go to next step. If test light glows, go to step 30).
Connect test light between cruise control module connectors "D" (Brown wire) and "E" (Black wire). If test light glows, go to next step. If test light does not glow, go to step 32).
Connect test light between cruise control module connectors "B" (Dark Blue wire) and "E" (Black wire). If test light does not glow, go to next step. If test light glows go to step 37).
Connect test light between cruise control module connectors "C" (Gray/Black wire) and "E" (Black wire). If test light does not glow, go to next step. If test light glows, go to step 39).
Set parking brake. Raise drive wheels off ground and support vehicle. Using a DVOM, measure voltage between cruise control module terminal "K" and ground. While observing DVOM display, rotate drive wheels by hand. If voltage varies between zero and 5 volts, go to next step. If voltage does not vary between zero and 5 volts, go to step 41).
Turn ignition switch to OFF position. Check for an open or poor connection between cruise connector module connector terminal "H" (Dark Green wire) and PCM. Reconnect cruise control module. Attach scan tool to DLC and start engine. Clear any DTCs. Monitor SMCC INHIBITED display on scan tool. Attempt to operate vehicle in cruise control. If SMCC INHIBITED is displayed at scan tool, go to step 43). If SMCC INHIBITED is not displayed, go to next step.
Turn ignition switch to OFF position. Turn ignition switch to RUN position. Clear any DTCs. Select MODE 4 DIAGNOSTICS on scan tool. With scan tool, command SMCC to ALLOW cruise. Using a DVOM, check voltage between cruise control module connector "H" (Dark Green Wire) and B +. If voltage is 9-14 volts, go to next step. If voltage is not 9-14 volts, go to step 13).
Replace cruise control module and recheck system. If cruise control system checks out, no further diagnosis is necessary.
Check for a short to B + at cruise control module connector, terminal "H" (Dark Green wire). If there is a short to B+, go to next step. If there is no short to B+, go to step 15).
Repair short to B + in circuit No. 83 (Dark Green Wire) and recheck system. If system functions correctly, no further testing is necessary.
If there is no short to B+, replace PCM and retest system. If system now functions correctly, no further testing is necessary.
Repair open or poor connection in circuit No. 739, cruise control module connector terminal "F" (Pink wire) to fuse block and retest system. If system tests okay, no further testing is necessary.
Repair open or poor connection between cruise control module connector "E" (Black wire) and ground. If system now functions correctly, no further testing is necessary.
Using a test light, probe between cruise control module connectors "B" (Dark Blue wire) and "E" (Black wire). While observing test light, press and hold SET/COAST switch. If test light glows, go to step 24). If test light does not glow, go to next step.
Check for a short to ground in circuit No. 397 (cruise control module connector terminal "A", Gray wire). If there is a short to ground, go to next step. If there is not short to ground, go to step 21).
Repair short to ground in circuit No. 397 and retest system. If system retests okay, no further testing is necessary.
Check for open circuit or poor connection between cruise control module connector terminal "A" (Gray wire) and multifunction lever. If there is a poor connection or open circuit go to next step. If there is no open circuit or poor connection, go to step 23).
Repair open or poor connection between cruise control module connector terminal "A" (Gray wire) and multifunction lever an recheck system. If system functions normally, no further testing is necessary.
Replace multifunction lever and retest system. If system functions normally, no further testing is necessary.
Check for poor connection between cruise control module connector, terminal "F" (Pink wire) and multifunction switch. If there is a poor connection or open in Pink wire, go to next step. If there is no open or poor connection, go to step 23).
Repair poor connection or open in circuit between cruise control module connector and multifunction switch and retest system. If system no tests okay, no further testing is necessary.
Check for short to ground at cruise control module connector, terminal "B" (Dark Blue wire). If there is a short to ground, go to next step. If there is no short to ground, go to step 28).
Repair short to ground in Dark Blue wire and retest system. If system is now okay, no further testing is necessary.
Check for poor connection or open in Dark Blue wire. If there is a poor connection or open in Dark Blue wire, go to next step. If Dark Blue wire is okay, go to step 23).
Repair poor connection or open in Dark Blue wire and retest system. If system tests okay, no further testing is necessary.
Check for a short between cruise control module connector "B" (Dark Blue wire) and "C" (Gray/Black wire). If there is a short between terminals "B" and "C", go to next step. Go to step 23) if there is no short.
Repair short between terminals "B" and "C" and retest system. If system tests okay, no further testing is required.
With a test light, backprobe cruise control release switch connector between terminal "B" (Pink wire) and ground. See WIRING DIAGRAM . If test light glows, go to step 34). If test light does not glow, go to next step.
Repair open or poor connection in Pink wire between cruise control release switch and fuse block and retest system. If system tests okay, no further testing is necessary.
Check for a poor connection or open circuit between cruise control release switch, terminal "A" (Brown wire) and cruise control module connector "D" (Brown wire).If there is a poor connection or open in Brown wire, go to next step. If Brown wire is okay, go to step 36).
Repair open or poor connection in Brown wire and recheck system. If system tests okay, no further testing is necessary.
Adjust or replace cruise control release switch and retest system. If system tests okay, no further testing is necessary.
Check for short to B+ between cruise control module connector, terminal "B" (Dark Blue wire) and multifunction switch. If there is a short to B+ in Dark Blue wire, go to next step. If there is no short to B+, go to step 23).
Repair short to B+ in Dark Blue Wire and retest system. If system tests okay, no further testing is necessary.
Check for a short to B+ between cruise control module connector terminal "C" (Gray/Black wire) and multifunction switch. If there is a short to B+ in Gray/Black wire, go to next step. If Gray/Black wire is okay, go to step 23).
Repair short to B+ in Gray/Black wire and retest system. If system tests okay, no further testing is necessary.
Check for open or poor connection between cruise control module connector terminal "K" (Dark Green wire) and PCM connector C1, terminal No. 13 (Dark Green wire). See WIRING DIAGRAM . If there is an open or poor connection in Dark Green Wire, go to next step. If Dark Green wire is okay, go to step 15).
Repair open or poor connection between cruise control module connector terminal "K" (Dark Green wire) and PCM connector C1, terminal No. 13 (Dark Green wire) and retest system. If system tests okay, no further testing is necessary.
Use scan tool to monitor the following parameters:
- VSS should be between 25-100 MPH.
- Transmission range should be 2nd, 3rd or 4th gear.
- System voltage should be 9-17 volts.
- Engine speed should be 500-5400 RPM.
If all parameters are within range, go to step 15). If parameters are out of range, go to next step.
Check for DTCs, repair and clear as necessary and retest system. If system tests okay, further testing is unnecessary.