Charging System (Diagnostics & Symptom Tests): Other Lexus IS III

PRECAUTION [04/2013 - ]

1. Check that the battery cables are connected to the correct terminals.
2. Disconnect the battery cables when the battery is given a quick charge.
3. Do not perform tests with a high voltage insulation resistance tester.
4. Never disconnect the battery cables while the engine is running.
5. Check that the charging cable nut is tightened on terminal B of the generator and the engine room relay block and junction block assembly.

Scheme 11

Scheme 12

PROCEDURE

1. CHECK BATTERY CONDITION NOTE: If the battery is weak or if the engine is difficult to start, perform the following procedure. Check the battery for damage and deformation. If severe damage, deformation or a leak is found, replace the battery. Check the electrolyte level in each cell. For maintenance-free batteries: If the electrolyte level is below the lower line, replace the battery. If the electrolyte level is above the lower line, check the battery voltage while cranking the engine. If the voltage is less than 9.6 V, recharge or replace the battery. HINT: Before checking the battery voltage, turn off all the electrical systems (headlights, blower motor, rear defogger, etc.). For non-maintenance-free batteries: If the electrolyte level is below the lower line, add distilled water to each cell. Then, recharge the battery and check the electrolyte specific gravity. Standard Specific Gravity 1.25 to 1.29 at 20°C (68°F) If the electrolyte level is above the lower line, check the battery voltage while cranking the engine. If the voltage is less than 9.6 V, recharge or replace the battery. HINT: Before checking the battery voltage, turn off all the electrical systems (headlights, blower motor, rear defogger, etc.). Check the voltage. Turn the engine switch off and turn on the headlights for 20 to 30 seconds. This will remove the surface charge from the battery. Measure the battery voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition Positive (+) terminal - Negative (-) terminal 20°C (68°F) 12.6 to 12.8 V If the voltage is not as specified, charge the battery.
2. CHECK BATTERY TERMINAL Check that the battery terminals are not loose or corroded. If the terminal is loose or corroded, tighten or clean the terminal.
3. CHECK FUSES Measure the resistance of each fuse for the charging system. HINT: The fuses shown in System Diagram are related to the charging system. Standard Resistance Below 1 ohms If any of the results is not as specified, replace the fuse(s) as necessary.
4. INSPECT V-RIBBED BELT Refer to «ON-VEHICLE INSPECTION [04/2013 - ]»(ref-665703-S10232799862014102400000)
5. INSPECT GENERATOR WIRING Visually check the generator wiring. Check that the wiring is in good condition.
6. CHECK FOR ABNORMAL NOISE Check for abnormal noises from the generator assembly. Check that no abnormal noises are heard from the generator assembly while the engine is running.
7. INSPECT CHARGE WARNING LIGHT CIRCUIT Turn the engine switch on (IG). Check that the charge warning light comes on. Start the engine and check that the charge warning light goes off. If the light does not operate as specified, troubleshoot the charge warning light circuit.
8. INSPECT CHARGING CIRCUIT WITHOUT LOAD Connect a voltmeter and an ammeter to the charging circuit as follows. *1 Generator Assembly *2 Battery *a Ammeter *b Terminal B *c Voltmeter Disconnect the wire from terminal B of the generator assembly and connect it to the negative (-) lead of the ammeter. Connect the ammeter positive (+) lead to terminal B of the generator assembly. Connect the voltmeter positive (+) lead to the positive (+) terminal of the battery. Ground the voltmeter negative (-) lead. Check the charging circuit. With the engine running at 2000 rpm, check the readings on the ammeter and voltmeter. Standard Current 10 A or more Standard Voltage 12.1 to 15.4 V If the result is not as specified, repair or replace the generator assembly. HINT: If the battery is not fully charged, the ammeter reading will sometimes be more than the standard current.
9. INSPECT CHARGING CIRCUIT WITH LOAD With the engine running at 2000 rpm, turn the high beam headlights on and turn the heater blower switch to the "HI" position. Check the reading on the ammeter. Standard Current 30 A or more If the result is not as specified, repair or replace the generator assembly. HINT: If the battery is fully charged, the reading will sometimes be less than the standard current. If this is the case, add more electrical load (operate the wipers, rear window defogger, etc.) and check the reading on the ammeter again.

Scheme 13

1. CHECK GENERATOR PULLEY WITH CLUTCH (ON-VEHICLE INSPECTION) Start the engine and visually check that the generator rotor assembly (fan) in the generator assembly is operating. OK The generator rotor assembly (fan) is operating. Result Result OK NG Result: 2 NG REPLACE GENERATOR PULLEY WITH CLUTCH. Refer to «COMPONENTS [04/2013 - ]»(ref-665778-S04023918242014102400000) Result: 1 OK See step 2
2. CHECK GENERATOR PULLEY WITH CLUTCH (UNIT INSPECTION) Remove the generator assembly. Refer to «REMOVAL [04/2013 - ]»(ref-665778-S20855372512014102400000) Check the installation condition of the generator pulley cap. OK The generator pulley cap is not loose or missing. Check for forming of particles due to friction (for dry type pulley) or grease leaks (for wet type pulley). OK There are no large amounts of particles (for dry type pulley) or grease leaks (for wet type pulley). Check the generator pulley with clutch for misalignment (interference with the generator assembly). OK The generator pulley with clutch is not misaligned (no interference with the generator assembly). Turn the generator pulley with clutch clockwise and counterclockwise by hand and check for noise. OK Noise does not occur when turned in both directions. Turn the generator pulley with clutch clockwise and counterclockwise by hand and visually check for runout. OK The generator pulley with clutch does not have runout. Hold the generator rotor assembly (fan) in the generator assembly with a screwdriver with its tip wrapped with protective tape, and check that the generator pulley with clutch locks when turned clockwise and turns freely when turned counterclockwise. OK The generator pulley with clutch locks when turned clockwise and turns freely when turned counterclockwise. *a Protective Tape Result Result OK NG Result: 1 OK REPAIR OR REPLACE GENERATOR ASSEMBLY. Refer to «COMPONENTS [04/2013 - ]»(ref-665778-S04023918242014102400000) Result: 2 NG REPLACE GENERATOR PULLEY WITH CLUTCH

1. CONFIRM PROBLEM SYMPTOM Confirm the problem symptom. Result Symptom Proceed to Noise occurs from V-ribbed belt assembly A Noise occurs from generator assembly B Result: 2 B See step 6 Result: 1 A See step 2
2. CHECK V-RIBBED BELT FOR WEAR Check the V-ribbed belt for wear or damage. OK The V-ribbed belt is not worn or damaged. Result Result OK NG Result: 2 NG REPLACE V-RIBBED BELT. Refer to «COMPONENTS [04/2013 - ]»(ref-665703-S25165214012014102400000) Result: 1 OK See step 3
3. CHECK GENERATOR PULLY WITH CLUTCH FOR WEAR Check the generator pulley with clutch grooves for wear or damage. OK The generator pulley with clutch grooves are not worn or damaged. Result Result OK NG Result: 2 NG REPLACE GENERATOR PULLEY WITH CLUTCH. Refer to «COMPONENTS [04/2013 - ]»(ref-665778-S04023918242014102400000) Result: 1 OK See step 4
4. CHECK FOR NOISE WHILE CLUTCH PULLEY IS OPERATING Start the engine and check the generator pulley with clutch for looseness. OK The generator pulley with clutch is not loose. Result Result OK NG Result: 2 NG TIGHTEN GENERATOR PULLEY WITH CLUTCH TO SPECIFIED TORQUE Result: 1 OK See step 5
5. INSPECT GENERATOR PULLEY WITH CLUTCH (UNIT INSPECTION) Remove the generator assembly. Refer to «REMOVAL [04/2013 - ]»(ref-665778-S20855372512014102400000) Check the installation condition of the generator pulley cap. OK The generator pulley cap is not loose or missing. Check for forming of particles due to friction (for dry type pulley) or grease leaks (for wet type pulley). OK There are no large amounts of particles (for dry type pulley) or grease leaks (for wet type pulley). Check the generator pulley with clutch for misalignment (interference with the generator assembly). OK The generator pulley with clutch is not misaligned (no interference with the generator assembly). Turn the generator pulley with clutch clockwise and counterclockwise by hand and check for noise. OK Noise does not occur when turned in both directions. Turn the generator pulley with clutch clockwise and counterclockwise by hand and visually check for runout. OK The generator pulley with clutch does not have runout. Hold the generator rotor assembly (fan) in the generator assembly with a screwdriver with its tip wrapped with protective tape, and check that the generator pulley with clutch locks when turned clockwise and turns freely when turned counterclockwise. OK The generator pulley with clutch locks when turned clockwise and turns freely when turned counterclockwise. *a Protective Tape Result Result OK NG Result: 1 OK INSPECT PULLEY OTHER THAN GENERATOR ASSEMBLY PULLEY. Refer to «PROCEDURE - Step 1»(ref-665778-S16674709552014102400000) Result: 2 NG REPLACE GENERATOR PULLEY WITH CLUTCH. Refer to «COMPONENTS [04/2013 - ]»(ref-665778-S04023918242014102400000)
6. CHECK FOR NOISE WHEN ROTOR IS TURNING FREELY Perform a road test and check that noise does not occur when decelerating. OK Noise does not occur. Stop the engine and check that generator pulley with clutch noise does not occur as the engine stops. OK Noise does not occur. Result Result OK NG Result: 2 NG REPLACE GENERATOR PULLEY WITH CLUTCH. Refer to «COMPONENTS [04/2013 - ]»(ref-665778-S04023918242014102400000) Result: 1 OK See step 7
7. CHECK ENGAGEMENT OF GENERATOR PULLEY WITH CLUTCH Remove the generator assembly. Refer to «REMOVAL [04/2013 - ]»(ref-665778-S20855372512014102400000) Using a screwdriver with its tip wrapped with protective tape, hold the generator rotor assembly (fan) in the generator assembly, and check that the generator pulley with clutch locks when turned from counterclockwise (free turning direction) to clockwise (locking direction). OK The generator pulley with clutch locks. Result Result OK NG Result: 1 OK REPAIR OR REPLACE GENERATOR ASSEMBLY. Refer to «COMPONENTS [04/2013 - ]»(ref-665778-S04023918242014102400000) Result: 2 NG REPLACE GENERATOR PULLEY WITH CLUTCH. Refer to «COMPONENTS [04/2013 - ]»(ref-665778-S04023918242014102400000)