DTC 61

Test AE: DTC 61 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 primary 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 primary lamp driver for 400 milliseconds DTC 61 is set.

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

Failure Condition: DTC 61 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 primary lamp driver for 400 milliseconds.

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

Conditions to Clear: DTC 61 will clear each time the ignition switch is turned "OFF."

POSSIBLE CAUSES:
Number(S) below refer to circled number(S) on the diagnostic chart.
1. When the DERM is configured for a serial data controlled warning lamp (smart cluster) DTC 61 will set. Clearing SIR diagnostic trouble codes will reset the DERM allowing the DERM to control the "INFLATABLE RESTRAINT" warning lamp.

DIAGNOSTIC AIDS:
Refer to Tests B and C to diagnose warning lamp circuit malfunctions. Test B Inflatable Restraint Warning Lamp Comes On Steady Test C Inflatable Restraint Warning Lamp Does Not Come On