B0608

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

CIRCUIT DESCRIPTION
The instrument cluster receives voltage inputs from 3 ignition signals. The instrument cluster receives voltage from the IGN 01 fuse when the ignition switch is in the off, accessory, on or start positions. The instrument cluster receives voltage from the CLUSTER fuse when the ignition switch is in the on position and the start position. The instrument cluster receives voltage from the CRANK SIGNAL fuse when the ignition switch is in the START position. If the instrument cluster does not receive any of the following voltage input combinations, a malfunction is present and this DTC sets:
^ If circuit 39 is active and circuit 1500 is inactive
^ If circuit 806 is active and circuit 1500 is inactive
^ If circuit 806 is active and circuit 39 is inactive

CONDITIONS FOR SETTING THE DTC
^ The instrument cluster does not detect voltage from circuit 1500 when the ignition switch is in the accessory, on or start positions, but the instrument cluster detects voltage in circuit 39 when the ignition switch is in the on position or the start position.
^ The instrument cluster detects voltage in circuit 806 when the ignition switch is in the start position, but the instrument cluster does not detect voltage in circuit 1500 when the ignition switch is in the accessory, on or start positions.
^ The instrument cluster detects voltage in circuit 806 when the ignition switch is in the start position, but the instrument cluster does not detect voltage in circuit 39 when the ignition switch is in the on position or the start position.
^ All conditions must be present for more than 0.3 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The instrument cluster stores DTC B0608 in memory.
^ The SERVICE VEHICLE SOON indicator turns on.

CONDITIONS FOR CLEARING THE DTC
^ Under all fault conditions the ignition switch must be cycled from on to off, back to on before this DTC will change from current to history.
^ The instrument cluster no longer detects an open or short to B+ in circuit 39, circuit 806, and circuit 1500.
^ A history DTC will clear after 100 drive cycles if the condition for this DTC is no longer present.
^ Use a scan tool.

DIAGNOSTIC AIDS
The following conditions may cause an intermittent malfunction to occur:
^ An intermittent open or short to voltage in circuit 39, circuit 806, or circuit 1500
^ Poor connections at the instrument cluster or fuse block
^ The instrument cluster is always detecting B+ from one or more of these 3 inputs.
^ The instrument cluster is never recognizing B+ from circuit 39, circuit 806, or circuit 1500.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
1. Always perform the instrument cluster diagnostic system check before attempting to diagnose DTC B0608.
2. This test will determine a short to B+ in circuit 39.
4. This test determines an open in circuit 39.
5. This test will determine a short to B+ in circuit 806.
8. This test determines an open in circuit 806.
9. This test will determine a short to B+ in circuit 1500.
11. This test will determine an open in circuit 1500.