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Home >> Mercury >> 2009 >> Mountaineer AWD V6-4.0L >> Repair and Diagnosis >> Body and Frame >> Body Control Systems >> Testing and Inspection >> Pinpoint Tests >> Smart Junction Box (SJB) >> Pinpoint Test A: DTC B106E/B106F
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Pinpoint Test A: DTC B106E/B106F




Smart Junction Box (SJB)

Pinpoint Tests

Pinpoint Test A: DTC B106E/B106F

Normal Operation

The Smart Junction Box (SJB) controls the output of the Daytime Running Lamps (DRL), fog lamps, one-touch down driver power window, accessory delay relay, windshield wiper park/run, windshield wiper speed, and windshield washer. When a repetitive fault causing a circuit overload is detected on any of the output circuits, the SJB disables the circuit by removing voltage, or ground, to the affected circuit. The circuit remains disabled until the fault is corrected and an on-demand self-test is run. After the on-demand self-test has been run, any DTCs related to the fault will be cleared.

- DTC B106E (Module Output Pin Disabled To Protect From External Fault) - sets when the SJB has temporarily disabled a circuit due to a repetitive fault causing a circuit overload. A corresponding DTC for the circuit in question will also set as follows:
- DTC B106F (Module Disabled Due to External Fault) - sets when one or more output functions are permanently disabled due to a repetitive circuit overload fault. DTC B106F will be set with DTC B106E. When DTC B106F is present, the SJB must be replaced after the fault condition has been corrected.
- DTC B1304 (Accessory Delay Relay Coil Circuit Short to Battery) - Accessory delay relay circuit short to battery voltage
- DTC B2512 (Front Fog Lamp Relay Ckt Short to Battery) - Fog lamp relay circuit short to battery voltage
- DTC B2973 (Daytime Running Lamp Output Shorted to Ground) - DRL output short to ground

This pinpoint test is intended to diagnose the following:

- Output circuit short to ground or voltage
- SJB



PINPOINT TEST A: DTCs B106E/B106F

NOTICE: If DTC B106F is present and the Smart Junction Box (SJB) is to be replaced, the fault condition must be corrected first. Failure to correct the fault condition first may cause damage to the new SJB, resulting in a repeat repair.

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A1 CHECK FOR DTC B106E


- Review the DTCs from the SJB self-test.
- Is DTC B106E present?

Yes
GO to A2.

No
GO to A3.

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A2 CHECK FOR OTHER DTCs


- Review the DTCs from the SJB self-test.
- Are any SJB DTCs present other than DTC B106E?

Yes
CORRECT any other DTCs. REFER to the Diagnostic Trouble Code (DTC) Chart Diagnostic Trouble Code (DTC) Chart. REPEAT the self-test (on-demand DTCs).

No
CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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A3 CHECK FOR DTC B106F


- Review the DTCs from the SJB self-test.
- Is DTC B106F present?

Yes
CORRECT any other DTCs. REFER to Diagnostic Trouble Code (DTC) Chart Diagnostic Trouble Code (DTC) Chart. INSTALL a new SJB. REFER to Smart Junction Box (SJB) Service and Repair. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern was caused by a fault in one of the output circuits.

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