Conditions for Clearing the DTC

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

A current DTC clears when the malfunction is no longer present.
A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

DTC B1440

Step	Action	Yes	No
Schematic Reference: Body Control System Schematics Connector End View Reference: Power and Grounding Connector End Views Data Communication Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Install a scan tool. Turn OFF the ignition. With a scan tool, monitor the following in Body Control Module, Data Display, Inputs: Ignition 0 Ignition 1 Ignition Accessory Does the scan tool indicate that all inputs are Inactive/Off?	Go to Step 3	Go to Step 6
3	Install a scan tool. Turn the ignition switch to ACC. With a scan tool, monitor the following in Body Control Module, Data Display, Inputs: Ignition 0 Ignition 1 Ignition Accessory Does the scan tool indicate that the Ignition 0 and Ignition Accessory inputs are Active/On?	Go to Step 4	Go to Step 8
4	Turn the ignition switch ON, with the engine OFF. With a scan tool, monitor the following in Body Control Module, Data Display, Inputs: Ignition 0 Ignition 1 Ignition Accessory Does the scan tool indicate that the all inputs are Active/On?	Go to Step 5	Go to Step 8
5	IMPORTANT: The engine may start in this step. Turn the engine OFF immediately after reviewing the input data. Turn the ignition switch to START. With a scan tool, monitor the following in Body Control Module, Data Display, Inputs: Ignition 0 Ignition 1 Ignition Accessory Does the scan tool indicate that the Ignition 0 and Ignition 1 inputs are On and the Ignition Accessory input is inactive?	Go to Step 11	Go to Step 8
6	Disconnect the ignition switch harness connectors. With a scan tool, monitor the following in Body Control Module, Data Display, Inputs: Ignition 0 Ignition 1 Ignition Accessory Does the scan tool indicate that any of the Ignition 0, Ignition 1 or Ignition Accessory inputs is Active/On?	Go to Step 7	Go to Step 9
7	Disconnect the body control module (BCM) harness connectors. Test the suspect ignition switch input circuits for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 14	Go to Step 11
8	Disconnect the ignition switch connectors. Install a 3-amp fused jumper between the suspect circuits and an ignition switch B+ supply. With a scan tool, monitor the suspect circuits in Body Control Module, Data Display, Inputs: Ignition 0 Ignition 1 Ignition Accessory Does the scan tool indicate that the suspect circuits are now Active/On?	Go to Step 9	Go to Step 10
9	Inspect for poor connections at the ignition switch harness connectors. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 14	Go to Step 12
10	Disconnect the BCM harness connectors. Test the suspect ignition switch input circuits for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 14	Go to Step 11
11	Inspect for poor connections at the BCM harness connectors. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 14	Go to Step 13
12	Replace the ignition switch. Refer to Ignition and Start Switch Replacement . Did you complete the replacement?	Go to Step 14	-
13	Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	Go to Step 14	-
14	Reconnect all components. Use the scan tool in order to clear DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	Go to Step 2	System OK