R071

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
DTC RO71 indicates a potential internal SDM malfunction and will set if any of the following conditions are detected: 1) 36 VLR voltage out of normal operating range, 2) Crash data recording reserve voltage discharge time failure for three consecutive ignition cycles, 3) The calculated checksum for internal memory does not match the stored value, 4) The voltage measured at "Driver Side Low" and/or "Passenger Side Low" is too high, 5) The sensing device inside the SDM which converts vehicle velocity changes to an electrical signal is malfunctioning, 6) The driver current source and/or passenger cuffent source is malfunctioning, 7) The temporary memory storage area is malfunctioning, 8) SDM is unable to read from or write to EEPROM, 9) The arming sensor inside the SDM is not closed during a deployment event, 10) DTC RO71 will set if RO25 has been set.

DTC WILL SET WHEN
Any of the indicated malfunctions are detected by the SDM. The malfunctions are tested at different times: 1) "Turn-ON" and "Continuous Monitoring," 2) "Turn-ON," 3) "Turn-ON," 4) "Continuous Monitoring," 5) "Turn-ON" and "Continuous Monitoring," 6) "Current Source Diagnostics," 7) "Turn-ON," 8) "Turn-ON," 9) Asynchronously, 10) "Turn-ON" and "Continuous Monitoring.

ACTION TAKEN
SDM turns "ON" the "AIR BAG" warning lamp and sets a diagnostic trouble code.

DTC WILL CLEAR WHEN
A scan tool "Clear Codes" command is received by the SDM. Some of the indicated malfunctions will only allow the "AIR BAG" warning lamp to go out briefly then come back "ON."