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. |
DTC Descriptor
DTC B3623 00: Steering Wheel Controls Adaptive Cruise Control (ACC) Gap Up/Down Signal CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | 1 | B3623 00 | -- | B3623 00 |
Adaptive Cruise Control Switch Signal | 1 | B3623 00 | 1 | B3623 00 |
1. Cruise Control Malfunction | ||||
Circuit/System Description
The body control module (BCM) 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 BCM determines the switch selection by the voltage drop across the resistor. The BCM sets DTC B3623 when it detects a stuck gap up/down switch.
Conditions for Running the DTC
Ignition is in RUN.
Conditions for Setting the DTC
Gap adjustment switch signal circuit remains in the same state for 1 minute.
Actions Taken When the DTC Sets
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The adaptive cruise control (ACC) is disabled. |
| • | The cruise control system is disabled. |
| • | Service Radar Cruise message is displayed in the driver information center (DIC). |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear after 40 malfunction-free ignition cycles have occurred. |
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, verify that the ACC Gap Switch parameter toggles accordingly between Up, Down and Inactive as the appropriate gap switch is pressed.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the steering wheel controls switch - left.
- Ignition ON, test for B+ between the B+ circuit terminal 1 and ground.
- Test for B+ between the B+ circuit terminal 1 and the signal circuit terminal 2.
- Ignition OFF, disconnect the X2 harness connector at the BCM.
- Test for infinite resistance between the signal circuit terminal 57 and ground.
- If all circuits test normal, test or replace the steering wheel controls switch - left.
| ⇒ | If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
| ⇒ | 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 BCM. |
| ⇒ | If less than the specified value, test the signal circuit for a short to ground. |
Component Testing
- Disconnect the harness connector at the steering wheel controls switch - left.
- Cruise control switch ON, measure the resistance between terminal 1 and terminal 2 while individually activating and holding each ACC gap function switch and compare the resistance reading to the values in the table below.
| ⇒ | If not within the specified resistance range, replace the steering wheel controls switch - left. |
Function Switch | Minimum Resistance Value | Maximum Resistance Value |
|---|---|---|
Neutral | O.L. | O.L. |
Cancel | 1.9k Ohms | 2.1k Ohms |
Gap Up | 3.5k Ohms | 3.7k Ohms |
Gap Down | 6.6k Ohms | 6.8k Ohms |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
