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 |
|---|---|---|---|---|---|
Ignition Voltage | 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
Connector End View Reference
Description and Operation
Cruise Control Description and Operation
Electrical Information Reference
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
- Ignition OFF, disconnect the X4 harness connector at the turn signal/multifunction switch.
- Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal A and ground.
- Verify the Cruise Control ON/OFF Switch parameter displays Off.
- Install a 3A fused jumper wire between the signal circuit terminal B and the ignition voltage circuit terminal A. Verify the Cruise Control ON/OFF Switch parameter displays On.
- Verify that the scan tool Cruise Set/Coast Switch parameter displays Inactive.
- Install a 3A fused jumper wire between the signal circuit terminal C and the ignition voltage circuit terminal A. Verify the scan tool Cruise Set/Coast Switch parameter displays Active.
- Verify that the scan tool Cruise Resume/Accel. Switch parameter displays Inactive.
- Install a 3A fused jumper wire between the signal circuit terminal D and the ignition voltage circuit terminal A. Verify the scan tool Cruise Resume/Accel. Switch parameter displays Active.
- If all circuits test normal, test or replace the turn signal/multifunction switch.
| ⇒ | If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the ECM. |
| ⇒ | 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. |
| ⇒ | If not the specified value, test the signal circuit terminal C for a short to voltage. If the circuit tests normal, replace the ECM. |
| ⇒ | 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. |
| ⇒ | If not the specified value, test the signal circuit terminal D for a short to voltage. If the circuit tests normal, replace the ECM. |
| ⇒ | 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. |
Component Testing
- Ignition OFF, disconnect the X4 harness connector at the turn signal/multifunction switch.
- Test for infinite resistance between terminal A and terminal B at the turn signal/multifunction switch.
- 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.
- Test for infinite resistance between terminals A and C at the turn signal/multifunction switch.
- 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.
- Test for infinite resistance between terminal A and terminal D at the turn signal/multifunction switch.
- 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.
| ⇒ | If not the specified value, replace the turn signal/multifunction switch. |
| ⇒ | If not the specified value, replace the turn signal/multifunction switch. |
| ⇒ | If not the specified value, replace the turn signal/multifunction switch. |
| ⇒ | If not the specified value, replace the turn signal/multifunction switch. |
| ⇒ | If not the specified value, replace the turn signal/multifunction switch. |
| ⇒ | If not the specified value, replace the turn signal/multifunction switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
