Heated Seats Inoperative Due To Key-In Ignition Switch Input

Possible Causes are:

• OBSERVE THE KEY-IN IGNITION SWITCH STATUS
• IGNITION SWITCH OPEN
• KEY-IN IGNITION SWITCH GROUND CIRCUIT OPEN
• KEY-IN IGNITION SWITCH SENSE CIRCUIT OPEN
• BCM INCORRECT KEY-IN IGNITION SWITCH STATUS

1. Ensure that the Key is still in the Ignition Switch. Using the DRBIII(R), enter Body Computer then Input Output and read the Key-In Ignition Switch status. Does the DRBIII(R) display: KEY IN IGN: CLOSED? If yes, test is complete. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
2. Turn ignition off. Disconnect the Ignition Switch harness connector. Connect a jumper between the Key-In Ignition Switch Sense circuit and Ground circuit. Using the DRBIII(R), enter Body Computer then Input Output and observe the Key-In Ignition Switch status. Does the DRBIII(R) display KEY IN IGN: CLOSED? If yes, replace the Ignition Switch. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
3. Turn ignition off. Disconnect the Ignition Switch harness connector. Turn all lights off. Measure the resistance between ground and the ground circuit in the ignition switch connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the ground circuit for an open. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.
4. Turn ignition off. Disconnect the Ignition Switch harness connector. Disconnect the Body Control Module C1 harness connector. Measure the resistance of the Key-In Ignition Switch Sense circuit between the ignition switch connector and the BCM C1 connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the Key-In Ignition Switch Sense circuit for an open. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.
5. Replace and program the Body Control Module. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.