B2101-IGNITION RUN/START INPUT CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

When Monitored:
While the CAN bus is RUN or SNA (signal not available) and the IOD status is “IN”. The Occupant Restraint Controller (ORC) checks the Fused Run/Start Relay Output (Run-Start) circuit voltage.
Set Condition:
With the ignition on, if voltage on the Fused Ignition Switch Output (Run-Start) circuit is equal to or below 6.25 +/- 0.25 volts or within 60 seconds of turning the ignition off, if the Fused Ignition Switch Output (Run-Start) circuit is between 2.4 to 5.0 volts.

Possible Causes

RUN/START RELAY OUTPUT CIRCUIT OPEN

OPEN TIPM FUSE 35

(F201) FUSED RUN/START RELAY OUTPUT CIRCUIT OPEN

(F201) FUSED IGNITION SWITCH OUTPUT CIRCUIT SHORTED TO GROUND

OCCUPANT RESTRAINT CONTROLLER (ORC)

Diagnostic Test

1. VERIFY THAT DTC B2101-IGNITION RUN/START INPUT CIRCUIT LOW IS ACTIVE IN THE ORC.

NOTE: Ensure the battery is fully charged.

Turn the ignition on.
With the scan tool, read Occupant Restraint Controller (ORC) DTC.

Does the scan tool display active: B2101-IGNITION RUN/START INPUT CIRCUIT LOW?

Yes

Go To 2

Go To 9

2. INSPECT TIPM RUN-START FUSE (TIPM 35)

Turn the ignition off.
Remove the TIPM Fuse 35 and inspect the fuse.

NOTE: Check connectors - Clean and repair as necessary.

Is the TIPM Fuse 35 open?

Yes

Go To 3

Go To 6

3. CHECK (F201) FUSED RUN/START RELAY OUTPUT CIRCUIT SHORTED TO GROUND

Measure the resistance of the (F201) Fused Run/Start Relay Output circuit between the TIPM Run-Start Fuse 35 output terminal and ground.

Is the resistance below 100.0 ohms?

Yes

Go To 4

Using the wiring diagram/schematic as a guide, inspect the related wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.
Replace TIPM Run-Start Fuse 35.
Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.

4. CHECK (F201) FUSED RUN/START RELAY OUTPUT CIRCUIT RESISTANCE WITH ORC DISCONNECTED

WARNING: If the Occupant Restraint Controller is dropped at any time, it must be replaced. Failure to take the proper precautions can result in accidental airbag deployment and serious or fatal injury.

WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

Disconnect the ORC connectors.

NOTE: Check connectors - Clean and repair as necessary.

Measure the resistance of the (F201) Fused Run/Start Relay Output circuit between TIPM Fuse 35 output terminal and ground.

Is the resistance below 100.0 ohms?

Yes

Go To 5

Replace the ORC in accordance with the Service Information.
Replace the TIPM Run-Start Fuse 35.
Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.

5. CHECK TIPM (F201) FUSED RUN/START RELAY OUTPUT CIRCUIT RESISTANCE

Disconnect the TIPM C7 connector.

NOTE: Check connectors - Clean and repair as necessary.

Measure the resistance of the (F201) Fused Run/Start Relay Output circuit between TIPM Fuse 35 output terminal and ground.

Is the resistance below 100.0 ohms?

Yes

Replace the TIPM in accordance with the Service Information.
Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1

Repair the shorted (F200) Fused Ignition Switch Output (Run-Start) circuit.
Replace the TIPM Run-Start Fuse 35.
Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.

6. CHECK FOR VOLTAGE AT THE TIPM FUSE 35 SUPPLY TERMINAL.

Turn the ignition on.
Measure the voltage of the Run/Start Relay Output between the TIPM Run-Start Fuse 35 supply terminal and ground.

Is the voltage above 6.0 volts?

Yes

Go To 7

Replace the TIPM in accordance with the Service Information.
Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.

7. CHECK (F201) FUSED RUN/START RELAY OUTPUT CIRCUIT FOR AN OPEN

WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

Reinstall the TIPM 35 Airbag Run-Start Fuse.
Disconnect both ORC connectors.

NOTE: Check connectors - Clean and repair as necessary.

Connect the Airbag Load Tool ORC 8443-32-L Adapter to the ORC connectors.

WARNING: To avoid serious or fatal injury, turn the ignition on, then reconnect the battery.

Measure the voltage of the (F201) Fused Run/Start Relay Output circuit between the TIPM Fuse 35 output terminal and ground.

Is the voltage above 6.0 volts?

Yes

Replace the Occupant Restraint Controller (ORC) in accordance with the Service Information.
Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.

Go To 8

8. CHECK TIPM (F201) FUSED RUN/START RELAY OUTPUT CIRCUIT VOLTAGE.

WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

Disconnect the TIPM C6 connector.

NOTE: Check connectors - Clean and repair as necessary.

Measure the voltage of the Run/Start Relay Output between the TIPM Run-Start Fuse 35 output terminal and ground.

Is the voltage above 6.0 volts?

Yes

Repair the open (F201) Fused Run/Start Relay Output (Run-Start) circuit between the ORC and the TIPM.
Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1

Replace the TIPM in accordance with the Service Information.
Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1

9. TEST FOR INTERMITTENT CONDITION

With the scan tool, record and erase all DTC from all Airbag modules.
If any ACTIVE codes are present they must be resolved before diagnosing any stored codes.

WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.
The following additional checks may assist you in identifying a possible intermittent problem.
Reconnect any disconnected components and harness connector.

WARNING: To avoid serious or fatal injury, turn the ignition on, then reconnect the battery.

With the scan tool, monitor active codes as you work through the following steps.

WARNING: To avoid serious or fatal injury, maintain a safe distance from all airbags while performing the following steps.

Wiggle the wiring harness and connectors of the related airbag circuit or component.
If only stored codes return, continue the test until the problem area has been isolated.
In the previous steps you have attempted to recreate the conditions responsible for setting the active DTC in question.

Does the scan tool display any ACTIVE DTC?

Yes

Select appropriate symptom from Symptom List.

No problem found Erase all codes before returning vehicle to customer.