Circuit Description
When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform a turn-on test to diagnose critical malfunctions within the SDM itself.
At this time, the SDM will establish communication with the passenger presence detection (PPD)/seat belt reminder (SBR) and the PPD/SBR will respond to the SDM by commanding the passenger air bag OFF indicator On for 5 seconds.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2502 Passenger Air Bag Disabled Indicator Circuit Malfunction
Conditions for Running the DTC
Ignition voltage is within the normal operating voltage range.
Conditions for Setting the DTC
The passenger OFF indicator lamp does not properly blink ON and OFF.
Action Taken When the DTC Sets
The SDM commands the air bag indicator ON.
Conditions for Clearing the DTC
Caution: The sensing and the diagnosis module (SDM) can maintain sufficient voltage to deploy the airbags and pretensioners for up to 1 minute after the ignition has been turned OFF and the fuse has been removed. If the airbags and pretensioners are not disconnected, do not begin service until one minute has been passed after disconnecting power to the SDM. Failure to do so may cause personal injury.
Caution: Do not strike or jolt the inflatable restraint sensing and diagnostic module (SDM). Before applying power to the SDM, make sure that it is securely fastened with the arrow facing toward the front of the vehicle. Failure to observe the correct installation procedure could cause SIR deployment, personal injury, or unnecessary SIR system repairs.
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views | ||||
1 | Did you perform a Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 | Inspect the fuse F11. Is fuse F11 blown? | -- | Go to Step 3 | Go to Step 4 |
3 | Replace the fuse F11. Did you complete the replacement? | -- | Go to Step 12 | -- |
4 |
Is the voltage as specified? | 9-16 V | Go to Step 6 | Go to Step 5 |
5 | Repair the wiring between fuse F11 and terminal 5 of the passenger air bag/seat belt warning lamp connector. Did you complete the repair? | -- | Go to Step 12 | -- |
6 | Inspect the connection between terminal 5 and terminal 6 (LHD), terminal 1 (RHD) of the passenger air bag/seat belt warning lamp. Is the connection OK? | -- | Go to Step 8 | Go to Step 7 |
7 | Replace the passenger air bag/seat belt warning lamp. Did you complete the replacement? | -- | Go to Step 12 | -- |
8 |
Is the resistance as specified? | 0 ohms | Go to Step 9 | Go to Step 11 |
9 | Measure the resistance between the terminal 56 of the SDM connector and ground, battery positive. Are the resistances as specified? | ∞ | Go to Step 10 | Go to Step 11 |
10 | Replace the SDM. Did you complete the replacement? | -- | Go to Step 12 | -- |
11 | Repair the wiring between the terminal 56 of the SDM and the instrument passenger air bag/seat belt warning lamp. Did you complete the repair? | -- | Go to Step 12 | -- |
12 |
Does the DTC reset? | Go to Step 2 | System OK | |
