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Test Description

WARNING: This page is about a different car, the 2006 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step checks for a proper reading of the ignition mode switch by the BCM.
  2. 11:  This step checks for a proper reading of the ignition mode switch by the RCDLR.
DTC B1440

Step Action Values Yes No
Schematic Reference: Power Distribution Schematics in Wiring Systems
Connector End View Reference: Master Electrical Component List in Wiring Systems
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
IMPORTANT: The engine may start during this procedure. Turn OFF the engine after verifying this power mode.
  1. With the scan tool, monitor the current power mode data from body control module (BCM), under Computer/Integrating Systems, Data Display menu.
  2. Place the vehicle in all power modes while checking for the parameter.
Does the current power mode data follow the ignition mode switch positions?		 - Go to Step 11  Go to Step 3 
3
  1. Turn OFF the ignition.
  2. Disconnect the ignition mode switch.
  3. Measure the voltage between the BCM ignition mode data signal circuit at the ignition mode switch connector and a good ground.
Is the voltage measured within the specified range?		 B+ Go to Step 4  Go to Step 6 
4 Install a test lamp between the BCM ignition mode data signal circuit at the ignition mode switch connector and a good ground.
Does the test lamp illuminate?		 - Go to Step 7  Go to Step 5 
5 Measure the voltage between the BCM ignition mode data signal circuit and the BCM ignition mode ground circuit at the ignition mode switch connector.
Is the voltage measured within the specified range?		 B+ Go to Step 9  Go to Step 8 
6
  1. Disconnect the BCM.
  2. Test the ignition mode data signal circuit of the BCM for an open or short to ground. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 26  Go to Step 22 
7
  1. Disconnect the BCM.
  2. Test the ignition mode data signal circuit of the BCM for a short to voltage. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 26  Go to Step 22 
8
  1. Disconnect the BCM.
  2. Test the ignition mode ground circuit of the BCM for an open or short to ground. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 26  Go to Step 22 
9 While measuring the resistance between the BCM ignition mode data signal and BCM ignition mode ground circuits at the ignition mode switch press the OFF/ACC button of the ignition mode switch.
Is the value measured approximately as specified?		 300 Ω Go to Step 10  Go to Step 24 
10 While measuring the resistance between the BCM ignition mode data signal and BCM ignition mode ground circuits at the ignition mode switch press the START button of the ignition mode switch.
Is the value measured approximately as specified?		 1500 Ω Go to Step 22  Go to Step 24 
11 
IMPORTANT: The engine may start during this procedure. Turn OFF the ignition after verifying this power mode.
  1. With a scan tool, monitor the ignition mode switch data from remote control door lock receiver (RCDLR), under Computer/Integrating Systems, Data Display menu.
  2. Turn the ignition in all power modes while checking for the parameter.
Does the ignition mode switch data follows the ignition mode switch positions?		 - Go to Step 20  Go to Step 12 
12
  1. Turn OFF the ignition.
  2. Disconnect the ignition mode switch.
  3. Measure the voltage between the RCDLR data signal circuit at the ignition mode switch connector and a good ground.
Is the voltage measured within the specified range?		 B+ Go to Step 13  Go to Step 15 
13 Install a test lamp between the RCDLR ignition mode data signal circuit at the ignition mode switch connector and a good ground.
Does the test lamp illuminate?		 - Go to Step 16  Go to Step 14 
14 Measure the voltage between the RCDLR ignition mode data signal circuit and the RCDLR ignition mode ground circuit at the ignition mode switch connector.
Is the voltage measured within the specified range?		 B+ Go to Step 18  Go to Step 17 
15
  1. Disconnect the RCDLR.
  2. Test the ignition mode data signal circuit of the RCDLR for an open or short to ground. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 26  Go to Step 20 
16
  1. Disconnect the RCDLR.
  2. Test the ignition mode data signal circuit of the RCDLR for a short to voltage. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 26  Go to Step 20 
17
  1. Disconnect the RCDLR.
  2. Test the ignition mode ground circuit of the RCDLR for an open or short to ground. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 26  Go to Step 20 
18 While measuring the resistance between the RCDLR ignition mode data signal and RCDLR ignition mode ground circuits at the ignition mode switch press the OFF/ACC button of the ignition mode switch.
Is the value measured approximately as specified?		 2000 Ω Go to Step 19  Go to Step 24 
19 While measuring the resistance between the RCDLR ignition mode data signal and RCDLR ignition mode ground circuits at the ignition mode switch press the START button of the ignition mode switch.
Is the value measured approximately as specified?		 0 Ω Go to Step 20  Go to Step 24 
20 Inspect for poor connections and terminal tension at the harness connector of the RCDLR module. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 26  Go to Step 21 
21 Replace the RCDLR module. Refer to Control Module References  for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 26  -
22 Inspect for poor connections and terminal tension at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 26  Go to Step 23 
23 Replace the BCM. Refer to Control Module References  for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 26  -
24 Inspect for poor connections and terminal tension at the harness connector of the ignition mode switch. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 26  Go to Step 25 
25 Replace the ignition mode switch. Refer to Switch Replacement - Ignition and Start, DIC Display and HUD Dimmer in Instrument Panel, Gages, and Console.
Did you complete the replacement?		 - Go to Step 26  -
26
  1. Reconnect all components.
  2. Use the scan tool in order to clear the DTC.
  3. 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
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