R062

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
When the ignition switch is first turned "ON" battery voltage is applied to the "AIR BAG" warning lamp and to the "Ignition 1" input terminal "B9." The SDM responds by flashing the "AIR BAG" warning lamp seven times alternating between the primary and redundant lamp drivers. The SDM monitors the redundant lamp driver output by comparing the output state at "SIR Indicator" terminal "A9" 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 RO62 is set.

DTC WILL SET WHEN
"Ignition 1" voltage is above a specified value and the output state at the "SIR Indicator" terminal "A9" does not match the commanded state of the redundant lamp driver for 400 milliseconds. This test is run every 100 milliseconds during "Continuous Monitoring" tests.

ACTION TAKEN
SDM attempts to turn "ON" the "AIR BAG" warning lamp using the primary lamp driver and sets a diagnostic trouble code.

DTC WILL CLEAR WHEN
The ignition switch is turned "OFF."

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test determines whether 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 SDM at terminal "A4" or an open in CKT 39B. A poor "Redundant Indicator Ground" connection to the SDM would set DTC RO62. It is important that the SDM mounting surface is rid of any dirt or foreign material and that the fasteners are properly torqued to ensure a good "Redundant Indicator Ground."