GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Envoy - 2WD 🢒 Engine 🢒 Cruise Control 🢒 Cruise Control Malfunction

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit

Short to Ground

High Resistance

Open

Short to Voltage

Signal Performance

B+

1

1

1

--

--

Stop Lamp Switch B+

P1574

P1574

P1574

--

--

Cruise Control ON/OFF Switch Signal

1

1

1

--

--

Cruise Control Resume/Accel. Switch Signal

1

--

1

P0567

--

Cruise Control Set/Coast Switch Signal

1

--

1

P0568

--

TCC Brake Switch/Cruise Control Release Signal

P1574

P1574

P1574

P1574

--

1. Cruise Control Malfunction

Circuit/System Description

The cruise control switch is an input to the engine control module (ECM). The ECM monitors the cruise control switch signal circuits in order to detect when a cruise control function switch has been activated. The ECM detects a voltage signal when a cruise control function switch is applied.

Reference Information

Schematic Reference

Cruise Control Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, cruise control switch ON, observe the Cruise Set/Coast and Cruise Resume/Accel. Switch parameters while pressing and releasing each switch. The switch parameters should change between Active and Inactive as the switch is pressed and released.

Circuit/System Testing
  1. Ignition OFF, disconnect the X4 harness connector at the turn signal/multifunction switch.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal A and ground.
    3. ⇒If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance.
  3. Verify the Cruise Control ON/OFF Switch parameter displays Off.
    4. ⇒If not the specified value, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Install a 3A fused jumper wire between the signal circuit terminal B and the B+ circuit terminal A. Verify the Cruise Control ON/OFF Switch parameter displays On.
    5. ⇒If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Verify that the scan tool Cruise Set/Coast Switch parameter displays Inactive.
    6. ⇒If not the specified value, test the signal circuit terminal C for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Install a 3A fused jumper wire between the signal circuit terminal C and the B+ circuit terminal A. Verify the scan tool Cruise Set/Coast Switch parameter displays Active.
    7. ⇒If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  7. Verify that the scan tool Cruise Resume/Accel. Switch parameter displays Inactive.
    8. ⇒If not the specified value, test the signal circuit terminal D for a short to voltage. If the circuit tests normal, replace the ECM.
  8. Install a 3A fused jumper wire between the signal circuit terminal D and the B+ circuit terminal A. Verify the scan tool Cruise Resume/Accel. Switch parameter displays Active.
    9. ⇒If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  9. If all circuits test normal, test or replace the turn signal/multifunction switch.

Component Testing
  1. Disconnect the X4 harness connector at the turn signal/multifunction switch.
  2. Test for infinite resistance between terminal A and terminal B at the turn signal/multifunction switch.
    3. ⇒If not the specified value, replace the turn signal/multifunction switch.
  3. Turn the cruise control ON/OFF switch ON. Test for less than 1 ohm between terminal A and terminal B at the turn signal/multifunction switch.
    4. ⇒If not the specified value, replace the turn signal/multifunction switch.
  4. Test for infinite resistance between terminals A and C at the turn signal/multifunction switch.
    5. ⇒If not the specified value, replace the turn signal/multifunction switch.
  5. Press and hold the Set/Coast switch. Test for less than 1 ohm between terminal A and terminal C at the turn signal/multifunction switch.
    6. ⇒If not the specified value, replace the turn signal/multifunction switch.
  6. Test for infinite resistance between terminal A and terminal D at the turn signal/multifunction switch.
    7. ⇒If not the specified value, replace the turn signal/multifunction switch.
  7. Press and hold the Resume/Accel. switch. Test for less than 1 ohm between terminal A and terminal D at the turn signal/multifunction switch.
    8. ⇒If not the specified value, replace the turn signal/multifunction switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Turn Signal Multifunction Switch Replacement
    •  Control Module References for ECM replacement, setup, and programming