Turn Signal on Message

TEST CONDITION(S)
Turn signal on.

FAILURE CONDITION(S)
Turn signal has been on for over 1 of mile.

ACTION TAKEN
Display TURN SIGNAL ON message.

DESCRIPTION
The turn signal flasher is provided voltage through the turn signal fuse (15) whenever the ignition is on. When the turn signal switch closes, providing a path to ground through the left or right turn signal lamps, the flasher alternately opens and closes. The BCM monitors CKT 16 to determine if the turn signal switch is closed and the turn signal lamps are on (i.e. toggling voltage). If the turn signals are left on for more than a one mile, the BCM will send the TURN SIGNAL ON message to the driver information center.

The voltage seen at the BCM can be monitored through parameter B117 in diagnostic mode. The correct input states should be:
Condition Input.
Signals Off HI.
Either Signal On Alternate between HI and LO, Bulbs lit while HI.

DIAGNOSIS
Ensure turn signals are functioning properly before diagnosing this message. If turn signals are not functioning properly, refer to Engine. Engine

Condition Possible Cause
Erroneous Message Intermittent short to ground in CKT 16.
NO Message Open in CKT 16.