Ford Explorer: Battery, Mounting and Cables / Diagnosis and Testing - Battery

Ford Explorer 2020-2025 Service Manual / Electrical / Battery and Charging System / Battery, Mounting and Cables / Diagnosis and Testing - Battery


General Equipment

Diagnostic Battery Charger
  1. Use Ford approved battery test equipment.
    • Midtronics MDX-650 or P-300/P-600/490/1050
    • Midtronics GRX-3590 or 3000

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Diagnostic Trouble Code (DTC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).


  Diagnostic Trouble Code Chart


Module   DTC Description Action
  BCM B11D9:09 Vehicle Battery:Component Failures   GO to Pinpoint Test C

Symptom Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Symptom Chart: Battery


Condition Action
Main engine compartment battery is not fully charged   GO to Pinpoint Test A
Auxiliary battery is not fully charged   GO to Pinpoint Test B

Pinpoint Test


PINPOINT TEST A : MAIN ENGINE COMPARTMENT BATTERY CONDITION TEST

Normal Operation and Fault Conditions

Battery condition is determined by measuring battery terminal voltage after a specific discharge current is applied for a specified time period.

Possible Sources

  • Main Battery
  • Wiring, terminals or connectors

Visual Inspection and Pre-checks

  • Inspect wiring, terminals and connectors.
  • Inspect the main engine compartment battery.
  • Inspect the main engine compartment battery mounting.
  • Inspect high current BJB connections.
A1 TEST THE MAIN ENGINE COMPARTMENT BATTERY CONDITION

NOTE: Failure to fully charge the battery before retesting may cause false readings.

  • Using the Diagnostic Battery Charger and the battery cables removed from the battery, verify the battery condition.

Is the battery OK?
Yes RETURN the battery to service.
No If the analyzer reads REPLACE BATTERY or REPLACE-BAD CELL, INSTALL a new battery.
REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

PINPOINT TEST B : AUXILIARY BATTERY CONDITION TEST

Normal Operation and Fault Conditions

Battery condition is determined by measuring battery terminal voltage after a specific discharge current is applied for a specified time period.

Possible Sources

  • Auxiliary Battery
  • Wiring, terminals or connectors

Visual Inspection and Pre-checks

  • Inspect wiring, terminals and connectors.
  • Inspect the auxiliary battery.
  • Inspect the auxiliary battery mounting.
  • Inspect high current BJB connections.
B1 TEST THE AUXILIARY BATTERY CONDITION

NOTE: Failure to fully charge the battery before retesting may cause false readings.

  • Disconnect and Remove the auxiliary battery and allow the battery to reach room temperature.
    REFER to: Battery Disconnect and Connect (414-01 Battery, Mounting and Cables, General Procedures).
  • Charge the auxiliary battery for 1 hour at 2 amps on AGM setting.
  • After the battery is charged, Remove the auxiliary battery's surface charge by connecting an incandescent (non-LED) test light for 5 minutes.
  • Allow the auxiliary battery to rest for 15 minutes.
  • Measure the auxiliary battery voltage.

Is the auxiliary battery voltage greater than 12 volts?
Yes RETURN the battery to service.
No INSTALL a new auxiliary battery.
REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

PINPOINT TEST C : B11D9:09

Normal Operation and Fault Conditions

The BCM monitors both the main battery and auxiliary battery. The main battery has a BMS and the auxiliary battery has a battery current sensor. The BMS for the main battery communicates on a dedicated LIN to the BCM. The battery current sensor for the auxiliary battery uses a PWM circuit which is wired to the BCM.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BCM B11D9:09 Vehicle Battery: Component Failures Sets in the BCM when the BMS senses a failed battery due to one of the following conditions.
  • Failure of the 12 volt main engine compartment battery
  • Disconnected 12 volt main engine compartment battery
  • Failure of the 12 volt auxiliary battery set after 10 engine cranks
  • Open auxiliary battery fuse (in the high current BJB)
  • Open auxiliary battery fuse (attached to the auxiliary battery post)
  • Disconnected 12 volt auxiliary battery, set after 10 engine cranks

Possible Sources

  • Auxiliary battery
  • Auxiliary battery fuses
  • Main engine compartment battery
  • Main engine compartment battery and auxiliary battery connections

Visual Inspection and Pre-checks

  • Verify the auxiliary battery fuses
C1 INSPECT ALL BATTERY CONNECTIONS
  • Ignition OFF.
  • Inspect the 12 volt main engine compartment battery connections.
  • Inspect the 12 volt auxiliary battery connections.

Are all battery cable connections securely fasten to the main and auxiliary battery?
Yes GO to C2
No Secure the loose battery cable(s) connections to the battery.

C2 CHECK THE AUXILIARY BATTERY FUSE
  • Verify that the auxiliary battery fuses are ok.
    • auxiliary battery fuse located in the high current BJB
    • auxiliary battery fuse located on the auxiliary battery positive post

Are the auxiliary battery fuses ok?
Yes GO to C3
No Verify that the battery cable is not shorted, If OK, Install a new auxiliary battery fuse(s). If shorted, REPAIR or REPLACE the auxiliary battery cable as needed.

C3 VERIFY THE BATTERIES CONDITION
  • Verify that the main battery and auxiliary battery condition. For the main battery GO to Pinpoint Test A For the auxiliary battery, GO to Pinpoint Test B

Do the main engine compartment battery and auxiliary battery pass the condition test?
Yes RETURN the battery to service. CLEAR the DTC and RETEST the system.
No If the analyzer reads REPLACE BATTERY or REPLACE-BAD CELL or does not pass the battery condition test, INSTALL a new battery for the one in question.
REFER to: Battery (414-01 Battery, Mounting and Cables, Removal and Installation).
or REFER to: Auxiliary Battery (414-01 Battery, Mounting and Cables, Removal and Installation).


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