Cruise Control Malfunction (With K59)
Cruise Control Malfunction (With K59)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The instrument panel module(IPM) monitors the adaptive cruise control (ACC) gap adjustment switch signal circuit to determine the driver selected headway. The gap switch is a momentary contact switch that connects a series of resistors. Each switch state, inactive, up and down, corresponds to a specific resistance value. The IPM determines the switch selection by the voltage drop across the resistor. The IPM sets DTC P1553 when it detects a stuck gap up/down switch.
The forward looking sensor (FLS) has the exclusive function of detecting, tracking and classifying targets within its specified field of view. The FLS has the ability to detect and react to objects of interest in its detection zone and is critical to the proper operation of the adaptive cruise control (ACC) system. When the distance sensing cruise control module (DSCC) detects that the FLS is out of alignment, DTC C1002 sets.
Reference Information
Schematic Reference
Cruise Control Schematics ([1][2]Cruise Control)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Cruise Control Description and Operation (Conventional Cruise Control) (Cruise Control Description and Operation (Conventional Cruise Control))Cruise Control Description and Operation (Adaptive Cruise Control) (Cruise Control Description and Operation (Adaptive Cruise Control))
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Engine ON, while rotating the steering wheel to both steering stops, observe the scan tool Adaptive Cruise Control Switch and the Adaptive Cruise Cancel Switch parameter while pressing each of the cruise control switches. The parameter should toggle between On, Off, Resume, Set and Cancel as the applicable switch is pressed.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the steering wheel controls switch - left.
2. Ignition ON, test for B+ between the voltage reference circuit terminal 1 and ground.
• If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the IPM.
3. Test for B+ between the voltage reference circuit terminal 1 and the signal circuit terminal 2.
• If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPM.
4. Ignition OFF, disconnect the X3 harness connector at the IPM.
5. Test for infinite resistance between the signal circuit terminal 18 and ground.
• If less than the specified value, test the signal circuit for a short to ground.
6. If all circuits test normal, test or replace the steering wheel controls switch - left.
Component Testing
Important: The cruise control switch must be ON in order to properly measure the resistance of the Cancel, the Gap Up, and Gap Down, or Cancel switches.
1. Disconnect the harness connector at the steering wheel control switch-left.
2. Connect a DMM between terminal 1 and terminal 2 at the steering wheel control switch-left.
3. Cruise control switch ON, measure the resistance while individually activating and hold each gap function switch and compare the resistance reading to the values for the Gap Up, Gap Down, Cancel or the neutral position.
• If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the steering wheel control switch-left.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Steering Wheel Control Switch Assembly Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for IPM replacement, setup, and programming