Circuit Description
The Passlock™ sensor monitors CKT 1870 at terminal C and terminal D while transmitting messages in order to determine if the message was sent. The Passlock™ sensor will resend messages when preempted by more important messages.
Conditions for Setting the DTC
The Passlock™ sensor monitors CKT 1807 at terminal C and terminal D while transmitting messages in order to determine whether the message was sent. If the Passlock™ sensor attempts to send a message and does not detect the message of CKT 1807, the message will be resent. After 3 attempts to send a message (in the absence of a more important message and not detecting the message), DTC U1193 is set.
Conditions for Clearing the MIL/DTC
| • | A history DTC will clear after 100 consecutive ignition cycles occur without a fault. |
| • | Use the Tech 2 scan tool in order to clear history and current DTCs. |
Diagnostic Aids
| • | A short to ground or a short to battery may set the DTC. The identified malfunctions would prevent serial data communications and the DTC may not be retrieved as a current DTC. |
| • | Faulty electrical connections or wiring cause most intermittent faults. Occasionally, a damaged Passlock™ sensor is at fault. Refer to Intermittents and Poor Connections Diagnosis for a detailed explanation of how to locate and repair intermittent conditions. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
This step confirms the presence of a malfunction.
-
This step tests for a DTC that may cause DTC U1193 to set.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Data Link Communications System Check? | -- | ||
Is the DTC U1193 current? | -- | |||
3 |
Is the repair complete? | -- | -- | |
Are any other Passlock™ sensor DTCs current? | -- | Go to Diagnostic System Check - Body Control System in Body Control System | ||
5 |
Is the procedure complete? | -- | -- |
