1998 Chevy Blazer Cruse does not work.

Tiny
DR448
  • MEMBER
  • 1998 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
The cruise has not worked for a couple years. Before the cruise finally stopped working completely; it would work for a short time when activated, then after 5 or 10 minutes of use, it would stop working alltogether. A couple days later, when I would try to use it - it would work for 5 or 10 minutes, then stop. This was how it acted before it finally stopped working for good. All this time, I thought the multifunction switch was the cause. I just replaced it with a new switch, but it did not resolve the problem of the cruise not working. Can you give some ideas what could be the problem, what I should try next to resolve this problem.
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Saturday, September 25th, 2010 AT 2:56 PM

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Tiny
MERLIN2021
  • EXPERT
First thing to check is do all brake lights work, proceed to testing if yes.

1. Disconnect cruise control module assembly connector. Turn ignition switch to RUN position. Connect a test light between cruise control module assembly connector (harness side) terminal "F" (Brown wire) and ground. See WIRING DIAGRAMS. If test light illuminates, go to next step. If test light does not illuminate, repair open in Brown wire between instrument panel fuse block and cruise control module assembly. 2. Connect a test light between cruise control module assembly connector (harness side) terminals "F" (Brown wire) and "E" (Black/White wire). See WIRING DIAGRAMS. If test light illuminates, go to next step. If test light does not illuminate, repair open in Black/White wire between cruise control module assembly and ground connection. 3. Turn cruise control switch to ON position. Connect a test light between cruise control module assembly connector (harness side) terminal "B" (Dark Blue wire) and ground. See WIRING DIAGRAMS. If test light does not illuminate, go to next step. If test light illuminates, check for a short to voltage in Dark Blue wire between multifunction lever (cruise control switch) and cruise control module assembly. If Dark Blue wire is okay, replace multifunction lever (cruise control switch). See STEERING COLUMN SWITCHES article. 4. Connect a test light between cruise control module assembly connector (harness side) terminal "C" (Gray/Black wire) and ground. See WIRING DIAGRAMS. If test light does not illuminate, go to next step. If test light illuminates, check for a short to voltage in Gray/Black wire between multifunction lever (cruise control switch) and cruise control module assembly. If Gray/Black wire is okay, replace multifunction lever (cruise control switch). See procedures in STEERING COLUMN SWITCHES article. 5. Connect a test light between cruise control module assembly connector (harness side) terminal "A" (Gray wire) and ground. See WIRING DIAGRAMS. If test light illuminates, go to step 7). If test light does not illuminate, go to next step. 6. Connect a test light between multifunction lever (cruise control switch) connector (harness side) terminal A13 (Brown wire) and ground. See WIRING DIAGRAMS. If test light illuminates, check for open in Gray wire between multifunction lever (cruise control switch) and cruise control module assembly. If Gray wire is okay, replace multifunction lever (cruise control switch). See STEERING COLUMN SWITCHES article. If test light does not illuminate, repair open in Brown wire between multifunction lever (cruise control switch) and instrument panel fuse block. 7. Turn ignition switch to RUN position. Connect a test light between cruise control module assembly connector (harness side) terminal "D" (Brown/White wire) and ground. See WIRING DIAGRAMS. If test light illuminates, go to step 10). If test light does not illuminate, go to next step (M/T) or step 9) (A/T). 8. Connect a test light between clutch switch connector (harness side) terminal "B" (Brown/White wire) and ground. See WIRING DIAGRAMS. If test light does not illuminate, go to next step. If test light illuminates, check for open in Brown/White wire between clutch switch and cruise control module assembly. If Brown/White wire is okay, replace clutch switch. Refer to BRAKE & CLUTCH RELEASE SWITCHES. 9. Connect a test light between brake switch connector (harness side) terminal "D" (Brown wire) and ground. See WIRING DIAGRAMS. If test light does not illuminate, check for open in Purple or Brown/White wire between brake switch and cruise control module assembly. If Purple or Brown/White wire is okay, replace brake switch. See BRAKE & CLUTCH RELEASE SWITCHES. If test light illuminates, check for open in Brown wire between brake switch and instrument panel fuse block. If Brown wire is okay, replace brake switch. See procedures in BRAKE & CLUTCH RELEASE SWITCHES. 10. Connect a test light between cruise control module assembly connector (harness side) terminal "B" (Dark Blue wire) and ground. See WIRING DIAGRAMS. Press and hold cruise control switch in SET position. If test light illuminates, go to next step. If test light does not illuminate, check for open in Dark Blue wire between multifunction lever (cruise control switch) and cruise control module assembly. If Dark Blue wire is okay, replace multifunction lever (cruise control switch). See STEERING COLUMN SWITCHES article. 11. Turn ignition switch to OFF position. Reconnect cruise control module assembly. Disconnect PCM connector C2, or VCM connector C4. Turn ignition switch to RUN position. Using a DVOM, measure voltage at PCM connector C2, terminal No. 16 (Dark Green/White wire), or VCM connector C4, terminal No. 3 (Dark Green/White wire). See WIRING DIAGRAMS. If voltage is about 7 volts, go to next step. If voltage is not about 7 volts, check for short to ground or open in Dark Green/White wire between PCM or VCM, and cruise control module assembly. If Dark Green/White is okay, replace cruise control module assembly. See CRUISE CONTROL MODULE ASSEMBLY. 12. Turn ignition switch to OFF position. Reconnect PCM or VCM connector. Set parking brake and start engine. Move cruise control switch to OFF position, and then to ON position. Wait 3 seconds. After 3 seconds, depress and hold SET button. Hold slider switch in Resume/Accelerate (R/A) position. Fully depress and hold brake pedal. After 10 seconds, release brake pedal while holding R/A and SET switches. Engine RPM should increase momentarily, and then return to idle. If engine RPM momentarily increases, check for poor connections at PCM or VCM. If connections are okay, replace PCM or VCM. If engine RPM does not momentarily increase, replace cruise control module assembly.
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Saturday, September 25th, 2010 AT 7:48 PM

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