Jaguar X-Type Sedan and Estate (Wagon). Manual - part 523
• NOTE: On vehicles fitted with a Battery Monitoring System (BMS), the diagnostic routine for quiescent drain testing in the approved
diagnostic system should be utilized.
• NOTE: If a customer complains of a vehicle battery that discharges continuously or when left for a prolonged period of time, it is
recommended that a quiescent drain test is performed as described below.
• NOTE: The battery drain should be measured using an approved diagnostic system or a Digital Multi-Meter (DVOM).
The vehicle should be in the locked/armed state (for example vehicle alarm fully armed), all doors, engine and luggage compartment lids are
open and latched (so as to appear closed from an electrical point of view). The test should take place after the vehicle has entered
shutdown mode. The time taken for this to occur after the ignition is switched off varies according to model - Refer to Quiescent Drain in
section 414-00 of the W orkshop Manual.
• NOTE: When the vehicle is armed, the effect of the security system Light Emitting Diode (LED) flashing is to cause a pulsation in the
measured current drain. In this case, either the average current should be taken (using a Digital Multi- Meter (DVOM) with an averaging
system) or the current reading taken, ignoring the brief high current peaks.
EQUIPMENT
Approved diagnostic system with current probe or Digital Multi-Meter (DVOM) with current probe.
METHOD OF MEASUREMENT
Using an Approved Diagnostic System
1. Switch off all electrical loads and ensure that the ignition is off.
2. Connect the current probe to the approved diagnostic system.
3. Calibrate the probe.
4. Install a clamp around the battery lead/junction box lead.
5. Go to the Quiescent Current Testing section.
Using a Digital Multi-Meter (DVOM)
• NOTE: Do not use an in-line DVOM to measure the quiescent drain on vehicles fitted with an electronic throttle. The current exceeds the
maximum amount the fuse in the DVOM is capable of handling.
1. Switch off all electrical loads and ensure that the ignition is off.
2. Connect the current probe to the DVOM.
3. Calibrate the probe.
4. Install a clamp around the battery lead/junction box lead.
5. Go to the following Quiescent Current Testing section.
QUIESCENT CURRENT TESTING
1. Switch ignition to ‘on’ or select ignition mode in keyless vehicles and switch to ‘off’ (do not crank).
2. Remove key from ignition switch (where applicable).
3. Open and latch all doors, hood and luggage compartment lid.
4. Lock the vehicle using the remote function on the remote handset. (Single lock only to avoid volumetric alarm arming).
5. Remove any other potential electrical drains such as accessories plugged into accessory sockets.
6. Record the amperage readings after the shutdown period. The model specific Amperage readings for quiescent drain are referenced in
Quiescent Drain in section 414-00 of the W orkshop Manual
7. Record the final reading on the battery report form Appendix B.
• NOTE: The preferred method of testing following an excessive current consumption figure is to use a current probe around individual
junction box leads to the various suspected circuits to identify a potential cause. This is in preference to the old method of removing fuses
for the following reasons:
Many modules take a considerable time to power down. Each time a fuse is removed and re-fitted, the quiescent drain current may
take an extended period of time to return to normal (typically up to 45 minutes).
The drain may be caused by a module remaining active and preventing the quiescent drain from reducing to normal levels.
The drain may be caused by a relay winding that is activated. Pulling the fuse can allow this to ‘reset’ and the drain will be lost and
go un-diagnosed.
APPENDIX A BATTERY TEST PROCESS
It is recommended that this test is conducted at least 24 hours after the vehicle engine has been run or the battery charged to avoid the
need of surface charge removal or if this time constraint is unacceptable due to circumstances, then conduct the charge strip removal
process.
Part 1 - Surface Charge Removal
• NOTE: Before carrying out a battery test you must ensure that there is no battery surface charge present.
• NOTE: The battery may be tested either on a bench or on the vehicle.
In the case of on-vehicle testing, the battery must be isolated from the vehicle by removal of the battery negative (-) cable from the
battery terminal before the measurement is taken unless the vehicle has a transit relay fitted or is in transit mode.
A vehicle which has had its battery charged or been driven in a 24 hour period before the test, must have its surface charge removed using
one of the following methods: