Circuit Description
When you first turn the ignition switch to the ON position, the inflatable restraint Sensing and Diagnostic Module (SDM) performs tests to diagnose critical malfunctions within itself. Upon passing these tests IGNITION 1, 23 VLR and deployment loop voltages are measured to make sure they are within their respective normal voltage ranges. The SDM monitors the voltages at the DRIVER SIDE LOW terminal 10 and PASSENGER SIDE LOW terminal 3 to detect shorts to B+ in the inflator module circuits. The service wait time is 10 minutes. Refer to Disabling the SIR System .
Conditions for Setting the DTC
| • | The voltage at DRIVER SIDE LOW terminal 10 is less than 3.5 volts. |
| • | The voltage at the PASSENGER SIDE LOW terminal 3 is more than 3.5 volts for 500 milliseconds. |
The CONTINUOUS MONITORING test checks for this DTC. This test occurs when IGNITION 1 is within the normal operating range.
Action Taken When the DTC Sets
| • | The SDM sets DTC B1019 and also DTC B1071. |
| • | The SDM turns ON the AIR BAG warning lamp. |
Conditions for Clearing the DTC
DTC B1019 is a latched code. You cannot clear a latched code. Repair the malfunction that set this DTC before you replace the SDM.
Diagnostic Aids
A short-to-B+ in the inflatable restraint (SIR) IP module circuit can cause an intermittent condition. A DTC B1019 would be accompanied by DTC B1071. Inspect the YEL/RED wire and the YEL wire carefully for cut or chafed wires. Wiring pigtail damage requires replacement of the inflatable restraint IP module. Be careful inspection of the circuits and components indicated on the DTC B1019 Table is essential in order to prevent damage to the replacement SDM.
The diagnostic table directs the technician to note the entry value of PASSENGER SENSELO. Comparing the value of the PASSENGER SENSELO can be helpful in determining if and intermittent condition exists.
When measurements are requested in this table, use J 39200 Digital Multimeter with the correct terminal adapter from J 35616 Connector Test Adapter Kit. When a check for proper connection is requested, refer to Intermittents and Poor Connections . When a wire, connector or terminal repair is requested, use J-38125 Terminal Repair Kit and refer to Wiring Repair in this section.
Test Description
Numbers below refer to step numbers on the diagnostic table.
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This test determines the PASSENGER SIDE LOW voltage measured by the inflatable restraint Sensing and Diagnostic Module (SDM).
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This test isolates the malfunction to one side of the inflatable restraint IP module yellow connector located behind the IP compartment.
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This test determines whether the malfunction is in the YEL/RED wire.
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This test determines whether the malfunction is in the YEL wire.
Notice: When DTC B1019 is set, it is necessary to replace the inflatable restraint Sensing and Diagnostic Module (SDM). Setting DTC B1019 also causes DTC B1071 to set. When a scan tool clear codes command is issued and the malfunction is no longer present, DTC B1019 and DTC B1071 will remain current. Ensure that the short to B+ condition is repaired prior to installing a replacement SDM in order to avoid damaging the SDM.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | ||
Did you read the PASSENGER SENSELO? Did you record PASSENGER SENSELO on the repair order? | -- | -- | ||
Is the PASSENGER SENSELO more than the specified value? | 3.5 V | |||
4 |
Did you replace the inflatable restraint IP module? | -- | -- | |
Is the measured voltage less than the specified value? | 1 V | |||
6 |
Is the circuit repair complete? | -- | -- | |
Measure the voltage on the SDM harness connector from terminal 3 to terminal 6 (ground). Is the measured voltage less than the specified value? | 1 V | Go to Integrity Check | ||
8 |
Is the circuit repair complete? | -- | -- | |
9 |
Did you reconnect all the SIR components? Did you properly mount all the SIR components? | 3.5 V | -- | |
10 | Clear the SIR diagnostic trouble codes. Have the SIR diagnostic trouble codes been cleared? | -- | -- |
