Battery, Mounting and Cables (Except Electric) Ford Focus ST III

General Specifications

Overview

The battery and cable system consists of the following components

1. Battery
2. Battery tray
3. High current BJB
4. Positive battery cable
5. Negative battery cable including a battery monitoring sensor

System Operation

The battery is a 12V DC source connected in a negative ground system and is a voltage stabilizer for the 12V electrical system.

The battery eye indicates the battery state-of-charge by responding to the specific gravity of a single battery cell electrolyte. The battery eye has a viewing plate, 2 colored balls of different specific gravity and a small passage. As the battery's state-of-charge and specific gravity changes, the balls change their position in the passageway and subsequently display a different color in the viewing eye.

Do not install a new battery based solely on the indication of the battery eye. The battery eye color simply indicates the battery state-of-charge, not its condition. For example, a red or yellow/black battery eye usually indicates the battery is discharged, not defective. If the battery eye indicates the battery may be discharged, recharge the battery before testing its condition.

Battery eye

Note. The primary purpose of the battery eye is to be a quick indicator of battery's state-of-charge for assembly plants and dealership pre-delivery processes.

1. Red - low state-of-charge
2. Yellow/Black - between high and low state-of-charge
3. Green - high state-of-charge
4. No color can occur after the battery has been in service for several years and some of the plate material has coated the balls
5. A clear battery eye can occur if the battery case becomes damaged and the electrolyte has fallen below the plates

Vehicles are equipped with a 12-volt, maintenance-free battery.

Ford Motor Company strongly recommends that all faulty lead-acid batteries be returned to an authorized recycling facility for disposal.

Battery Condition Test

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

Visual Inspection and Diagnostic Pre-checks

1. Inspect wiring, terminals and connectors.
2. Inspect the battery.
3. Inspect battery mounting.
4. Inspect high current BJB connections.

PINPOINT TEST A: BATTERY CONDITION TEST

1. A1 TEST THE BATTERY CONDITION NOTE: A red test-eye indicates the battery is discharged, not necessarily damaged. NOTE: Failure to fully charge the battery before retesting may cause false readings. Verify the battery condition using the Intelligent Diagnostic Charger. 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»(/ford/focus-st/iii-2012-2015/remont/charging-system/#battery-mounting-and-cables-except-electric) .

Scheme 1

Scheme 2

Scheme 3

1. Refer to: «HEALTH AND SAFETY PRECAUTIONS»(/ford/focus-st/iii-2012-2015/remont/oem-general-information/#service-information-introduction-except-electric) .
2. Torque : 22 Nm
3. Torque : 5 Nm

1. Reverse the disconnection procedure.

Battery Drain Check

1. Refer to: «HEALTH AND SAFETY PRECAUTIONS»(/ford/focus-st/iii-2012-2015/remont/oem-general-information/#service-information-introduction-except-electric) .
2. Make sure the junction box(es)/fuse panel(s) are accessible without turning on the interior lights or the underhood lights.
3. Drive the vehicle for at least 5 minutes over 48 km/h (30 mph) to activate the vehicle systems.
4. Allow the vehicle to sit with the ignition off for at least 40 minutes to allow the modules to time out/power down.
5. Connect a fused jumper wire (30A) between the battery ground cable terminal and the strut tower ground bracket to prevent modules from resetting.
6. Disconnect the battery ground cable terminal from the strut tower ground bracket without breaking the connection of the jumper wire.
7. Connect the meter between the battery ground cable terminal and the strut tower ground bracket.
8. Remove the jumper wire.
9. Note the amperage draw. Draw varies from vehicle to vehicle depending on the equipment package. Compare to a similar vehicle for reference.
10. If the current draw is excessive, remove the fuses from the BJB one at a time and note the current drop. When the current level drops to an acceptable level after removing a fuse, the circuit containing the excessive draw has been located. The excessive draw can be isolated by continuing to pull subsystem fuses. Do not reinstall the fuses until testing is finished. To correctly isolate each of the circuits, all of the fuses may need to be removed, then install one fuse and note the amperage draw, remove the fuse and install the next fuse. Continue this process with each fuse.
11. Once the main circuit is identified, continue to remove the fuses from the BCM one at a time and note the current reading. Do not reinstall the fuses until testing is finished. To correctly isolate each of the circuits, all of the fuses may need to be removed, then install one fuse and note the amperage draw, remove the fuse and install the next fuse. Continue this process with each fuse.
12. Check the OEM WIRING DIAGRAMS for any circuits that run from the battery without passing through the BJB or the BCM. If the current draw is still excessive, disconnect these circuits until the draw is found. Also, disconnect the generator electrical connections and retest if the draw cannot be located. The generator may be internally shorted, causing the current drain.

Scheme 4

1. Refer to: «HEALTH AND SAFETY PRECAUTIONS»(/ford/focus-st/iii-2012-2015/remont/oem-general-information/#service-information-introduction-except-electric) .
2. Refer to: «Battery»(/ford/focus-st/iii-2012-2015/remont/charging-system/#battery-mounting-and-cables-except-electric) .
3. ST vehicles Torque : 10 Nm

Installation

1. To install, reverse the removal procedure.

Scheme 5

Scheme 6

1. Refer to: «HEALTH AND SAFETY PRECAUTIONS»(/ford/focus-st/iii-2012-2015/remont/oem-general-information/#service-information-introduction-except-electric) .
2. Refer to: «Battery Disconnect and Connect»(/ford/focus-st/iii-2012-2015/remont/charging-system/#battery-mounting-and-cables-except-electric) .
3. Refer to: «AIR CLEANER»(/ford/focus-st/iii-2012-2015/remont/removal-installation/#intake-air-distribution-and-filtering-20l-duratec-he) . Refer to: «INTAKE AIR DISTRIBUTION AND FILTERING - 2.0L ECOBOOST»(/ford/focus-st/iii-2012-2015/remont/removal-installation/#intake-air-distribution-and-filtering-20l-ecoboost) ).
4. Torque : 8 Nm

1. To install, reverse the removal procedure.
2. NOTE: If the battery has been replaced, use the scan tool and carry out the BMS Reset after the battery is connected. If the BMS Reset is not carried out, the state of charge measurement will be lower than the new battery state of charge and will be inaccurate. Carry out the «POWER ROOF OPENING PANEL INITIALIZATION»(/ford/focus-st/iii-2012-2015/remont/sun-rooft-topconvertible-top/#sunroof-roof-opening-panel-except-electric__power-roof-opening-panel-initialization) and the «POWER DOOR WINDOW INITIALIZATION»(/ford/focus-st/iii-2012-2015/remont/windows/#glass-frames-and-mechanisms-vehicles-with-one-touch-up-door-window-except-electric) . If these procedures are not carried out after battery replacement, loss of the one-touch open and one-touch close functions for the roof opening panel and power window systems will occur. Refer to: «POWER DOOR WINDOW INITIALIZATION»(/ford/focus-st/iii-2012-2015/remont/windows/#glass-frames-and-mechanisms-vehicles-with-one-touch-up-door-window-except-electric) ). Refer to: «POWER ROOF OPENING PANEL INITIALIZATION»(/ford/focus-st/iii-2012-2015/remont/sun-rooft-topconvertible-top/#sunroof-roof-opening-panel-except-electric__power-roof-opening-panel-initialization) .

Removal

Note. This procedure provides information about routing, retaining points and connectors of the cable. It does not include the steps for removing components to gain access to the cable.

Scheme 7

Scheme 8

1. Refer to: «HEALTH AND SAFETY PRECAUTIONS»(/ford/focus-st/iii-2012-2015/remont/oem-general-information/#service-information-introduction-except-electric) .
2. Refer to: «JACKING AND LIFTING - OVERVIEW»(/ford/focus-st/iii-2012-2015/remont/hoistjack/#jacking-lifting-except-electric) .
3. Refer to: «Battery Disconnect and Connect»(/ford/focus-st/iii-2012-2015/remont/charging-system/#battery-mounting-and-cables-except-electric) .
4. Torque : 12 Nm Torque : 5 Nm Torque : 10 Nm Torque : 22 Nm
5. Torque : 17 Nm Torque : 12 Nm Torque : 6 Nm

1. To install, reverse the removal procedure.

Note. This procedure provides information about routing, retaining points and connectors of the cable. It does not include the steps for removing components to gain access to the cable.

Scheme 9

Scheme 10

1. Refer to: «HEALTH AND SAFETY PRECAUTIONS»(/ford/focus-st/iii-2012-2015/remont/oem-general-information/#service-information-introduction-except-electric) .
2. Refer to: «JACKING AND LIFTING - OVERVIEW»(/ford/focus-st/iii-2012-2015/remont/hoistjack/#jacking-lifting-except-electric) .
3. Refer to: «Battery Disconnect and Connect»(/ford/focus-st/iii-2012-2015/remont/charging-system/#battery-mounting-and-cables-except-electric) .
4. Torque : 5 Nm Torque : 10 Nm Torque : 22 Nm
5. Torque : 6 Nm Torque : 12 Nm Torque : 17 Nm ST vehicles Torque : 12 Nm

1. To install, reverse the removal procedure.

See also:
• SERVICE INFORMATION
• AIR CLEANER
• INTAKE AIR DISTRIBUTION AND FILTERING - 2.0L ECOBOOST
• POWER ROOF OPENING PANEL INITIALIZATION
• POWER DOOR WINDOW INITIALIZATION
• JACKING AND LIFTING - OVERVIEW
• Battery