Operation CHARM: Car repair manuals for everyone.
Home >> Ford >> 2009 >> F 150 2WD V8-5.4L Flex Fuel >> Repair and Diagnosis >> Body and Frame >> Body Control Systems >> Testing and Inspection >> Pinpoint Tests >> Smart Junction Box (SJB) >> Pinpoint Test I: DTC B1318
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Pinpoint Test I: DTC B1318




Smart Junction Box (SJB)

Pinpoint Test I: DTC B1318

Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information. Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) monitors the voltage from the battery to determine if it goes above or below specific thresholds and sets DTC B1318 in continuous memory if the SJB detects low battery voltage below 10 volts on circuit SDC04 (RD).

- DTC B1318 (Battery Voltage Low) - a continuous memory DTC that sets when the SJB detects battery voltage below 10 volts on circuit SDC04 (RD).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- High circuit resistance
- SJB



PINPOINT TEST I: DTC B1318

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

I1-I5:





I5-I6:




pro multis · About Operation CHARM