Service Information

Captiva

DTC U1405

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 U1405: Invalid Data Received from Cruise Control Switch

The body control module (BCM) sends data to the engine control module (ECM). The data is sent to the ECM through a communication network called the local area network (LAN). Two circuits are used to communicate LAN data between the BCM and TCM. A fault in the LAN will not cause DTC U1405 to set by itself. If a LAN fault occurs, other DTCs will set in addition to DTC U1405.

If the ECM receives invalid transmission data from the BCM, this DTC sets.

Conditions for Running the DTC

Ignition switch is ON.

Conditions for Setting the DTC

The ECM receives no valid data from the BCM.

Action Taken When the DTC Sets

•	The service vehicle soon (SVS) lamp will be illuminated as soon as the error occurs.

•	The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in Failure Records buffers.

•	A history DTC is stored.

Conditions for Clearing the DTC

•	The SVS lamp will turn off after current driving cycle in which the diagnostic runs without a fault.

•	A history DTC will clear after 20 consecutive warm up cycles without a fault.

•	DTCs can be cleared by using the scan tool.

•	Disconnecting the ECM battery feed for 10 seconds.

Circuit/System Verification

DTC U1405 only sets when another DTC is set. DTC U1405 will clear after diagnosing the other DTC. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .