DTC B3794
Diagnostic Instructions
DTC Descriptors
| DTC B3794 08: Cruise Control Function Request
Circuit Signal Invalid |
| DTC B3794 61: Cruise Control Function Request
Circuit Actuator Stuck |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open or High Resistance
|
Short to Voltage
|
Signal Performance
|
B+
|
1
|
1
|
1
|
-
|
Signal
|
1
|
P0564
|
B3794 08, P0567, P0568
|
B3794 61, P0564
|
1. Cruise Control Malfunction
|
|
| |
Circuit/System Description
The cruise control switch is an input to the body control module
(BCM). The BCM monitors the cruise control on/off, set/coast,
resume/accelerate and cancel switches via the cruise control switch
signal circuit in order to detect when the driver has requested to
perform a cruise control function. The BCM detects a specific
voltage signal on the cruise control switch signal circuit when a
switch is applied. The BCM sends a serial data message to the
engine control module (ECM) indicating the status of the cruise
control switches.
Conditions for Running the DTC
| • |
The cruise switch is
ON. |
Conditions for Setting the DTC
B3794 08
The BCM detects an invalid voltage signal on the cruise control
switch signal circuit for 1 second.
B3794 61
Stuck switch for either Resume/Accel or Set/Coast button for 60
seconds.
Actions Taken When the DTC Sets
| • |
The malfunction indicator lamp
(MIL) will not illuminate. |
| • |
The cruise control system is
disabled. |
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
Cruise Control Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Cruise Control Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Engine ON, while rotating the steering wheel to both steering
stops, observe the scan tool Cruise Control 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 S70L steering wheel control
switch-left. |
| 2. |
Ignition ON, test for B+
between the B+ circuit terminal 1 and ground. |
| ⇒ |
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 K9 BCM. |
| 3. |
Test for B+ between the B+
circuit terminal 1 and the signal circuit terminal 3. |
| ⇒ |
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 K9 BCM. |
| 4. |
Ignition OFF, disconnect the
X3 harness connector at the K9 BCM. |
| 5. |
Test for infinite resistance
between the signal circuit terminal 9 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 S70L steering wheel control switch-left.
|
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
