DTC 62

Test AF: DTC 62 Redundant SIR Indicator Circuit Failure:

Supplemental Inflatable Restraint (SIR):

OPERATION:
When the ignition switch is first turned "ON", battery voltage is applied to the "INFLATABLE RESTRAINT" warning lamp and to the "Ignition 1" input terminals "A9" and "A10." The DERM responds by flashing the "INFLATABLE RESTRAINT" warning lamp 7 times alternating between the primary and redundant lamp drivers. The DERM monitors the redundant lamp driver output by comparing the output state at "SIR Indicator" terminal "B1" to the microprocessor commanded state. When "Ignition 1" is above a specified value and the output state does not match the commanded state of the redundant lamp driver for 400 milliseconds DTC 62 is set.

Test Conditions: Tested every 100 milliseconds during "Continuous Monitoring" tests.

Failure Conditions: DTC 62 will set when "Ignition 1" voltage is above a specified value and the output state at the "SIR Indicator" terminal "B1" does not match the commanded state of the redundant lamp driver for 400 milliseconds.

Action Taken: DERM attempts to turn "ON" the "INFLATABLE RESTRAINT" warning lamp using the primary lamp driver and sets a Diagnostic Trouble Code.

Conditions to Clear: DTC 62 will clear each time the ignition switch is turned "OFF."

POSSIBLE CAUSES:
Test Description: Number(S) below refer to circled number(S) on the diagnostic chart.
1. This test checks for an open in the "Redundant Indicator Ground" circuit.
2. This test determines if the malfunction is due to an open in the "Redundant Indicator Ignition 1"circuit.

DIAGNOSTIC AIDS:
An intermittent condition is likely to be caused by a poor connection to the DERM at terminal "A2" or "B2," an open in CKT 1450 or an open in CKT 39B.