Lexus NX: On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. CHECK AUXILIARY BATTERY

(a) Check that the auxiliary battery cables are connected to the correct terminals.

HINT:

If they are not, connect them properly.

(b) Check the auxiliary battery for damage and deformation.

HINT:

If severe damage, deformation or leakage is found, replace the auxiliary battery.

2. CHECK AUXILIARY BATTERY ELECTROLYTE VOLUME

(a) Check the volume of the electrolytes in each cell.

Standard electrolyte level:

Middle of upper line and lower line

If the electrolyte level is below the middle, replace the auxiliary battery.

3. CHECK AUXILIARY BATTERY VOLTAGE

(a) Turn the power switch off and turn on the high beam headlights for 30 seconds. This will remove the surface charge from the auxiliary battery.

(b) Measure the auxiliary battery voltage according to the value(s) in the table below.

4. RECHARGE AUXILIARY BATTERY

(a) Recharge the auxiliary battery.

(b) Turn the power switch off and turn on the high beam headlights for 30 seconds. This will remove the surface charge from the auxiliary battery.

(c) Measure the auxiliary battery voltage according to the value(s) in the table below.

5. CHECK AUXILIARY BATTERY TERMINAL, FUSIBLE LINK AND FUSE

(a) Check that the auxiliary battery terminals are not loose or corroded.

Torque:

Positive (+) auxiliary battery terminal :

5.4 N·m {55 kgf·cm, 48 in·lbf}

Negative (-) auxiliary battery terminal :

5.4 N·m {55 kgf·cm, 48 in·lbf}

If the terminals are corroded, clean them.

(b) Measure the resistance of each fusible link and fuse for the auxiliary battery charging system.

Standard Resistance:

Below 1 Ω

If any of the results is not as specified, replace the fusible link or fuse as necessary.

6. CHECK AMD TERMINAL

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Check that the AMD terminal is connected securely, and there is no contact problem.

If there are any arc marks, replace the affected parts.

(c) Check that the nut for the AMD terminal is tightened to the specified torque.

HINT:

If there are no arc marks and the AMD terminal connection is faulty, connect the AMD terminal securely.

(d) Install the service plug grip.

7. CHECK DC/DC CONVERTER FUNCTION

(a) Connect the AC/DC 400 A probe to the positive (+) auxiliary battery cable.

*a Probe Direction *b Current Flowing into Auxiliary Battery

(b) Turn the power switch on (READY) and leave the vehicle as it is until the electric current flowing into the auxiliary battery becomes 10 A or less.

(c) With the power switch on (READY), set the headlight position switch and blower motor switch to the HI position, and then turn the rear window defogger on.

(d) Measure the current and voltage according to the value(s) in the table below. Result: Item Tester Connection Condition Specified Condition Current flowing from auxiliary battery Positive (+) auxiliary battery cable Power switch on (READY) (The high beam headlights are on, the blower motor switch is in the HI position, and the rear window defogger is turned on.) 0 A or less (no current from auxiliary battery) Auxiliary battery voltage Positive (+) auxiliary battery terminal - Negative (-) auxiliary battery terminal 13.8 to 14.7 V If the result is not as specified, replace the inverter with converter assembly.

*a Probe Direction *b Current Flowing from Auxiliary Battery

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