Make sure the ignition switch is in "LOCK" (OFF) position and
all battery feed accessories are OFF.
1. Disconnect the negative cable from the battery before

disconnecting the positive cable.

WARNING

Care should be taken in the event the battery case is
cracked or leaking to protect hands from the electro-
lyte. A suitable pair of rubber gloves (not the house-
hold type) should be worn when removing battery by
hand.

2. Remove the battery from the vehicle.
3. Inspect battery carrier for damage caused by loss of acid

from the battery. If acid damage is present, it is necessary to
clean area with a solution of clean warm water and baking
soda. Scrub area with a stiff bristle brush. Wipe clean with a
cloth moistened with ammonia or baking soda in water.

4. Clean the battery, especially the top with same solutions as

described in step 3.

AC208957

HYDROMETER

TEMPERATURE
GAUGE

A: 27(1.1)
B: 35(1.4)

mm (in)

BATTERY

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CHASSIS ELECTRICAL

54A-6

5. Inspect the battery case and cover for cracks. If cracks are

present, battery must be replaced.

6. Clean the battery post with a suitable battery post cleaning

tool.

7. Clean the inside surfaces of the terminal clamps with a

suitable battery terminal cleaning tool. Replace damaged or
frayed cables and broken terminal clamps.

8. Install the battery in the vehicle.
9. Connect the positive and negative cables to the battery in

the order of mention.

10.Tighten the clamp nut securely.

BATTERY CHARGING

M1541001100521

WARNING

When batteries are being charged, an explosive gas forms beneath the cover of each cell. Do
not smoke near batteries on charge or which have recently been charged. Do not break live
circuits at the terminals of the batteries on charge. A spark will occur where the live circuit is
broken. Keep all open flames away from the battery.

Battery electrolyte temperature may temporarily be
allowed to rise to 55

°C (131°F). Increase of electro-

lyte temperature above 55

°C (131°F) is harmful to

the battery, causing deformation of battery cell,
decrease in life of battery, etc.

CHARGE RATE

If the test indicator is white, the battery should be charged as outlined below. When the dot appears or when
maximum charge shown below is reached, charging should be stopped.

Charge Rate Chart

BATTERY TEST

M1541001200528

BATTERY TESTING PROCEDURE

STEP 1. Check the battery cables.
Remove the negative cable, then the positive cable.
Check for dirty or corroded connections.

Q: Are the battery cables dirty or have corroded

connections?
YES :

Clean the battery cables. Then go to Step 2.

NO :

Go to Step 2.

STEP 2. Check the battery post.
Check for loose battery post.

Q: Are the battery posts faulty?

YES :

Replace the battery. Then go to Step 4.

NO :

Go to Step 3.

STEP 3. Check the battery case and cover.
(1) Remove the hold-downs and shields.
(2) Check for broken/cracked case or cover.

Q: Is the battery case or cover faulty?

YES :

Replace the battery. Then go to Step 4.

NO :

Go to Step 4.

BATTERY

BCI Group size 86

BCI Group size 24

Slow charging

5 amps 10 hours

5 amps 11.2 hours

10 amps 5 hours

10 amps 5.6 hours

Fast charging

20 amps 2.5 hours

20 amps 2.8 hours

30 amps 1.67 hours

30 amps 1.87 hours

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-7

STEP 4. Check the open circuit voltage.
(1) Turn headlights on for 15 seconds.
(2) Turn headlights off for two minutes to allow

battery positive voltage to stabilize.

(3) Disconnect the battery cables.
(4) Read open circuit voltage.

Q: Is open circuit voltage 12.4 volts or more?

YES :

Go to Step 5.

NO :

Charge the battery at 5 amps for 10.4 hours.
Then re-test.

STEP 5. Check the load test.
(1) Connect a load tester to the battery.
(2) Load the battery at the recommended discharge

rate (See LOAD TEST RATE CHART) for 15
seconds.

(3) Read voltage after 15 seconds, then remove

load.

(4) Compare the measured value with the minimum

voltage (See LOAD TEST CHART).

Q: Is the voltage higher than minimum voltage?

YES :

The battery is normal.

NO :

Replace the battery. Then go to Step 4.

LOAD TEST RATE CHART

LOAD TEST CHART

IGNITION SWITCH

GENERAL DESCRIPTION

M1543000100535

IGNITION KEY REMINDER TONE ALARM

The ignition key reminder tone alarm will sound
under the following condition, and warn the driver to
remove the ignition key.

• The driver's door is opened when the ignition

switch is at "LOCK" (OFF) or "ACC" position with-
out removing the ignition key.

However, the light reminder tone alarm will take pre-
cedence over this function.

DOOR LOCK PREVENTION FUNCTION

If the key is left in the ignition switch while the driver’s
door opened or the assistant door opened, all door
are automatically unlock to prevent locking the igni-
tion key in the vehicle after door is locked.

IMMOBILIZER SYSTEM

The immobilizer system consists of the ignition key,
the key ring antenna, immobilizer-ECU, and the
PCM. The ignition key has a built-in transponder. The
key ring antenna is installed on the steering lock key
cylinder. Only the registered ignition key permits the
engine to start, therefore, the engine can never be
started by means of a forged key or by connecting
the ignition wiring directly. The system is significantly
safe and reliable against theft. In addition, the driver
has only to turn the ignition switch to the "ON" posi-
tion to activate the immobilizer system. If the require-
ments for starting the engine are not satisfied, the
engine will be immobilized. If a registered ignition key
is lost, all your ignition keys need to be registered
again using scan tool MB991958 (MUT-III Sub
Assembly) to ensure security (Refer to

P.54A-37

An additional ignition key can be registered as fol-
lows (only if no ignition keys are lost):

Load test

252 amps

Cranking ratio (0

°F)

525 amps

550 amps

Reserve capacity

90 minutes

115 minutes

Application

BCI Group size 86

BCI Group size 24

TEMPERATURE

°C

(

°F)

21 (70)
AND
ABOVE

16 (60)

10 (50)

4 (40)

−1 (30)

−7 (20)

−12 (10) −18 (0)

Minimum voltage

9.6

9.5

9.4

9.3

9.1

8.9

8.7

8.5

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