Description and principle of operation of the battery (Defender 2007+)

Location of elements

Battery junction box

Pos.	spare no	Name
1	parts	Power to battery junction box (BJB)
2	-	Battery terminals
3	-	Battery
4	-	Main fuse
5	-	Positive battery cable
6	-	Negative battery cable
7	-	BJB

Review

The battery is installed in a secure box under the left seat. The battery rests on a platform to which it is attached with clamping bars and bolts.

The cables are attached to the battery terminals by means of clamp terminals.

On «positive» The pole piece contains a 500 A fusible insert. The insert is in a black case and is one piece with the terminal. Power to the BJB is taken up to the main fuse, from a tap on the terminal.

The main fuse should blow in the event of a collision (with a direct short circuit of the cable to «mass»), cutting off power to the alternator and starter, but keeping the rest of the onboard systems powered through the central fuse box (CJB).

Battery type - H8 with a semi-hermetic case. Each cell is provided with a vent to compensate for the thermal expansion of the electrolyte and release oxygen and hydrogen, which are formed under certain operating conditions of the battery.


Before removing the battery, make sure the car alarm is off and the ignition is off. Always disconnect the negative terminal first, then the positive. When installing a battery, always connect the positive terminal first and then the negative.

If the battery needs to be recharged, always use a DC charger designed for lead-calcium batteries. DO NOT use quick chargers as this may permanently damage the battery.

Starter fuse

The 500A main fuse is built into the wire between the battery and the starter/alternator. The fuse is installed near the positive battery terminal and is integrated with the wire assembly. In the event of a blown fuse, the entire wire assembly must be replaced.

Central fuse box

NOTE: Left hand drive vehicle shown.

Description of the CJB relay

Location	Description
1	headlight relay
2	Heated rear window relay
3	Purifier relay
4	Power window relay
5	Turn signal relay
6	Alarm relay

Description of CJB fuses

Name	Item number	Denomination (A)	Fuse color	Protected electrical circuits
F8	16	10	Red	Anti-theft alarm system
F9	15	15	Blue	Windshield wipers/washers
F10	14	10	Red	Rear window cleaner/washer
F11	13	10	Red	Anti-Lock Braking System
F12	12	10	Red	Speed sensor
F13	11	10	Red	Stop lights
F14	10	10	Red	Reversing lamps
F15	9	5	Beige	Ignition
F16	8	-	-	Not used
F17	7	-	-	Not used
F18	17	10	Red	Marker lights (left)
F19	18	10	Red	Marker lights (rights)
F20	19	10	Red	Illumination / clock illumination
F21	20	10	Red	Hazard light switch
F22	21	10	Red	dipped beam (right headlight)
F23	22	10	Red	dipped beam (left headlight)
F24	23	10	Red	high beam (right headlight)
F25	24	10	Red	high beam (left headlight)
F26	25	10	Red	Rear fog lights
F27	26	10	Red	alarm siren
F28	36	20	Yellow	Rear window heating
F29	35	20	Yellow	Cooling Fan/A/C Clutch Jumper
F30	34	10	Red	Audio/clock/diagnostic connector
F31	33	15	Blue	Hazard light switch
F32	32	-	-	Not used
F33	31	20	Yellow	seat heater
F34	30	20	Yellow	Power Window (right)
F35	29	20	Yellow	Power Window (left)
F36	28	30	Green	Heated windshield
F37	27	30	Green	Spare fuse
F38	37	10	Red	Engine ECU/PCM
F39	38	5	Beige	Engine ECU/PCM
F40	39	-	-	Not used
F41	40	5	Beige	Engine ECU/PCM
F42	41	10	Red	Air conditioning switch
F43	42	20	Yellow	cigarette lighter
F44	43	5	Beige	Audio system
F45	44	30	Green	Electric blower fan
F46	45	-	-	Not used
F47	46	-	-	Not used
Diagnostic connector	47	-	-	Diagnostic connector

The central fuse box is located on the side under the steering column. To gain access to the fuses, turn the mounting screws fully counterclockwise and remove the cover.

NOTE: Some early 07 model year models have CJB units that differ in installation side. The illustration above shows a left handed (LH) option for all other vehicles. Early right hand (RH) the variant is a mirror image of the standard LH left handed CJB.

Battery junction box

Relay description (VDO)

Item number	Description
1	Anti-Lock Brake Pump Relay (ABS)
2	Power relay
3	Starter relay
4	Glow plug relay
5	Air Conditioning Clutch Relay
6	Air conditioning cooling fan relay
7	Air Conditioning Accessory Relay
8	Heated windshield relay
9	Timed glass heating relay

Description of VDO fuses

Name	Item number	Denomination (A)	Fuse color	Protected electrical circuits
F1	16	30	Green	Anti-Lock Braking System
F2	15	20	Yellow	Socket for connecting additional equipment
F3	14	20	Yellow	High beam warning/horn
F4	13	20	Yellow	Not used
F5	12	30	Green	Main Relay/Engine Control Module (ECM)
F6	11	15	Blue	Anti-theft alarm system
F7	10	20	Yellow	Anti-theft alarm system

Description of VDO fuse links

Item number	Denomination (A)	Fuse color	Protected electrical circuits
22	100	Blue	Glow plug relay, fuses 2, 3 and 4, fuses 1, 2 and 3 and fuse 36 in CJB
21	60	Yellow	CJB Battery Power
20	60	Yellow	Power window relay
19	30	Green	ABS return pump
18	60	Yellow	Ignition Switch/Starter Relay
17	30	Green	Light switch
23	-	-	Main battery power

The battery junction box is located under the right front seat. To gain access to it, you need to remove the seat base.