R042

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

During the 'Turn-On' tests performed at the beginning of each ignition cycle, the DERM delays charging of the 'DRIVER'S 36 VLR', terminal 'A4', and 'Passenger's 36 VLR', terminal A3', power supplies. After the delay has expired, both '36 VLR' power supplies are allowed to charge. The DERM monitors each '36 VLR' power supply to ensure each has charged to a voltage of 32.5 volts within 30 seconds after Ignition 1 voltage is first applied to the DERM. When either, '36 VLR' power supply does not reach 32.5 volts within the 30 seconds, or once reaching the 32.5 volts, falls below it for 500 milliseconds, Code R042 will set.

TEST CONDITION(S)

Tested every 100 milliseconds while 'Continuous Monitoring' tests active.

FAILURE CONDITION(S)

Voltage at the 'DRIVER'S 36 VLR' or 'PASSENGER'S 36 VLR', terminal 'A4' or 'A3', is less than 32.5 volts for 500 milliseconds.

ACTION TAKEN

1. DERM turns on the 'INFLATABLE RESTRAINT' indicator.

2. 'SERVICE SUPPLEMENTAL INFLATABLE RESTRAINT' message is displayed on DIC.

NOTES ON FAULT TREE

1. Checks 'DRIVER'S 36 VLR' circuit for a short to ground.

2. Checks 'PASSENGER'S 36 VLR' circuit for a short to ground.

3. Checks for a short to voltage on 'DRIVER'S 36 VLR' circuit.

4. Checks for a short to voltage on 'PASSENGER'S 36 VLR' circuit.