NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION

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Warning
•  Before removing the SRS air bag system-related parts, always disconnect the negative battery terminal and wait for 1 min. or more to allow the back-up power supply to deplete its stored power. (See AIR BAG SYSTEM SERVICE WARNINGS [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See AIR BAG SYSTEM SERVICE WARNINGS [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
Caution
•  With the battery connected and the ignition switched ON, or if servicing is performed for a long period (10 min or more) with the ignition switched off.

Required procedure after negative battery terminal disconnection/connection

System name

Conditions after disconnecting the negative battery terminal

Required procedure

Reference

Before disconnecting negative battery terminal

After connecting negative battery terminal
i-stop system
Specified information in the PCM cleared and the i-stop does not operate normally.
Verify PID “BATT_SOC” value and record. *1
Perform battery condition initial setting (i-stop setting). *2
(See BATTERY CONDITION INITIALIZATION SETTING (i-stop SETTING).)
Power window system
Reset to initial setting and auto-function is disabled.
—
Perform the power window system initial setting.
(See POWER WINDOW SYSTEM INITIALIZATION PROCEDURE.)
Sunroof system
Reset to initial setting and function is disabled.
—
Perform the sunroof system initial setting.
(See SUNROOF SYSTEM INITIALIZATION PROCEDURE.)
Position memory system
Position memory system memory is reset.
Verify the setting content.
Set the verified content before disconnecting negative battery terminal.
—
Clock and audio
Clock display and audio system memory are reset.
Verify the setting content.
Set the verified content before disconnecting negative battery terminal.
—

*1  :Because the “BATT_SOC” value before disconnecting the negative battery terminal is required for the battery condition initial setting (i-stop setting), record the “BATT_SOC” value before disconnecting the negative battery terminal.
*2  :For vehicles with i-stop, if the negative battery terminal is disconnected and re-connected, battery condition initial setting (i-stop setting) must be performed.

Vehicle With i-stop


Negative battery terminal disconnection

1.  Connect the M-MDS to the DLC-2.

2.  Switch the ignition ON (engine off).

3.  Verify the “BATT_SOC” value using the M-MDS data logger function. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION))].) (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION))].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.5T].) (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].)

4.  Record the “BATT_SOC” value.

“BATT_SOC” value is less than 75%
•  Inspect the battery. (See BATTERY INSPECTION.)
“BATT_SOC” value is 75% or more
•  Go to the next step.

5.  Switch the ignition off.

Caution
•  If the nut for the current sensor is loosened with the negative battery terminal connected to the battery, excessive torque will be applied to the negative battery terminal and the battery terminal will be damaged. When removing the negative battery terminal and current sensor, be careful not to damage the battery terminal.
•  Be careful not to contact the positive battery terminal.

6.  Disconnect the current sensor connector.

Note
•  The positive battery cable nut cannot be removed to prevent it from falling off.

7.  Disconnect the negative battery terminal.

•  When disconnecting the plastic deformed negative battery terminal, expand the gap of the negative battery terminal using a flathead screwdriver, and remove the nut.
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Negative battery terminal connection

Caution
•  Connect the negative battery terminal before connecting the current sensor connector. If the current sensor connector is connected first, the PCM may mistakenly recognize a signal from the current sensor and learn the battery condition incorrectly.
•  Verifying the tightness while holding the current sensor may apply excessive force to the terminal and the terminal could loosen, causing poor engine starting. When verifying the tightness of the negative battery terminal, only hold the terminal area, not the current sensor.
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1.  Perform battery condition initial setting (i-stop setting). (See BATTERY CONDITION INITIALIZATION SETTING (i-stop SETTING).)

Note
•  Connection of the negative battery terminal and the current sensor connector will be done in the battery condition initial setting (i-stop setting) procedure.

2.  Perform services not related to i-stop control which are required after connecting the negative battery terminal. (See Required procedure after negative battery terminal disconnection/connection.)


Vehicle Without i-stop


Negative battery terminal disconnection

1.  Switch the ignition to off.

2.  Disconnect the negative battery terminal.


Negative battery terminal connection

Caution
•  When tightening the negative battery terminal, tighten it to the specified torque. If it is not tightened to the specified torque, the battery charging/discharging may be affected. (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION)].)(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)].)(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.5T].)(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)

1.  Connect the negative battery terminal.

2.  Perform services which are required after connecting the negative battery terminal. (See Required procedure after negative battery terminal disconnection/connection.)