B1422

Diagnostic Chart (Part 1 of 3):

Diagnostic Chart (Part 2 Of 3):

Diagnostic Chart (Part 3 Of 3):

Schematic:

CIRCUIT DESCRIPTION
The BCM receives three voltage inputs. The BCM receives voltage from the (IGN 0, CLUSTER, PCM, and BCM fuse) circuit at all times except when the ignition switch is off. The BCM receives voltage from the (PCM, the BCM, and the U/H Relay fuse) circuit when the ignition switch is in the on or start position. The BCM receives voltage from the (CRANK SIGNAL, BCM, CLUSTER) fuse through the crank circuit when the ignition switch is in the start position.

CONDITIONS FOR SETTING THE DTC
The BCM sets DTC B1422 when detecting any of these conditions for more than 0.3 seconds:
^ Voltage in IGN 1 circuit is greater than 8 volts, and voltage in the IGN 0 circuit is less than 1.5 volts.
^ Voltage in crank circuit is greater than 4.5 volts, and voltage in the IGN 0 circuit is less than 1.5 volts.
^ Voltage in crank circuit is greater than 4.5 volts, and voltage in the IGN 1 circuit is less than 1.5 volts.

ACTION TAKEN WHEN THE DTC SETS
The BCM stores DTC B1422 in memory.

CONDITIONS FOR CLEARING THE DTC
^ The BCM no longer detects an open or short to B+ in the IGN 1 circuit, the IGN 0 circuit, or the CRANK circuit.
^ A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ Using a scan tool.

DIAGNOSTIC AIDS
^ If the DTC B1422 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagrams.
^ The following conditions may cause an intermittent malfunction to occur:
^ An intermittent open or short to B+ in the IGN 1 circuit, the IGN 0 circuit, or the CRANK circuit.
^ Poor connections at the BCM, or the fuse block.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. This step tests for a short to ground in the crank circuit.
4. This step tests for a short to ground in the IGN 0 circuit.
6. This step tests for a short to B+ in the IGN 0 circuit.
7. This step tests for an open in the IGN 1 circuit.
8. This step tests for a short to B+ in the crank circuit.
9. This step tests for an open in the crank circuit.
10. This step tests for a short to B+ in the IGN 0 circuit.
11. This test tests for an open in the IGN 0 circuit.
12. This test determines whether the malfunction is intermittent or whether the BCM is faulty.