C1925

SUSPENSION CONTROL: ACTIVE STABILIZER SUSPENSION SYSTEM: C1925,C194E: Low Capacity Sub Battery

DESCRIPTION

The active stabilizer suspension system has its own battery. If a problem occurs in the battery (for active stabilizer) charging circuit, DTCs C1925 and C194E are stored.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK VEHICLE CONDITION

(a) Confirm with the customer that the vehicle has not been used for purposes other than standard driving.

OK:

No other parts are installed to battery (for active stabilizer)

Vehicle has not been used in harsh conditions (slalom driving for extended periods of time, etc.)

NG -- TEST FOR RECURRENCE OF PROBLEM
OK -- Continue to next step.

2. INSPECT ACTIVE STABILIZER BATTERY CURRENT SENSOR

(a) Turn the engine switch off.

(b) Disconnect the E active stabilizer battery current sensor connector.

NG -- REPLACE ACTIVE STABILIZER CURRENT SENSOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - ACTIVE STABILIZER BATTERY CURRENT SENSOR)

(a) Disconnect the z8 rear active stabilizer control ECU connector.

(b) Disconnect the E active stabilizer battery current sensor connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK SURROUNDING CONDITIONS (AMBIENT TEMPERATURE)

(a) Check the ambient temperature of the active stabilizer converter.

OK:

No factors causing high temperatures

NG -- ELIMINATE FACTORS CAUSING HIGH TEMPERATURES
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - ACTIVE STABILIZER CONVERTER)

(a) Disconnect the e1 rear active stabilizer control ECU connector.

(b) Disconnect the e4 active stabilizer converter connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (ACTIVE STABILIZER CONVERTER - BATTERY)

(a) Disconnect the e3 active stabilizer converter connector.

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

Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. INSPECT BATTERY (for Active Stabilizer)

(a) Wait 10 minutes after stopping the engine.

(b) Inspect the voltage of the battery terminals.

Standard voltage:

12.4 V or higher

HINT
If the result is not as specified, charge the battery, wait 10 minutes or more and inspect the voltage of the battery terminals again.

NOTICE:
The terminals of the battery must be connected correctly when replacing the battery. If the battery terminals are connected incorrectly (positive and negative terminals connected in reverse), replace the active stabilizer converter and STB DC/DC fuse with new ones.

NG -- REPLACE BATTERY (for Active Stabilizer)
OK -- Continue to next step.

8. INSPECT FUSE (STB RR)

(a) Remove the STB RR H-fuse from the luggage room No. 6 relay block.

(b) Measure the resistance according to the value(s) in the table below.

:

NG -- CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (RELAY BLOCK - BATTERY)

(a) Remove the rear active stabilizer relay from the luggage room No. 6 relay block.

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

Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

10. INSPECT REAR ACTIVE STABILIZER RELAY (Marking: STB RR)

(a) Remove the rear active stabilizer relay from the luggage room No. 6 relay block.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

NG -- REPLACE ACTIVE STABILIZER RELAY
OK -- Continue to next step.

11. INSPECT FRONT ACTIVE STABILIZER RELAY (Marking: STB FR)

(a) Remove the front active stabilizer relay from the luggage room No. 6 relay block.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

NG -- REPLACE FRONT ACTIVE STABILIZER RELAY
OK -- Continue to next step.

12. CHECK ACTIVE STABILIZER RELAY CIRCUIT

(a) Remove the front and rear active stabilizer relays from the luggage room No. 6 relay block.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

NG -- REPAIR OR REPLACE LUGGAGE ROOM RELAY BLOCK
OK -- Continue to next step.

13. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK)

(a) Disconnect the e1 rear active stabilizer control ECU connector.

(b) Remove the rear active stabilizer relay from the luggage room No. 6 relay block.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

14. CHECK HARNESS AND CONNECTOR (FRONT ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK)

(a) Disconnect the A49 front active stabilizer control ECU connector.

(b) Remove the front active stabilizer relay from the luggage room No. 6 relay block.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

15. CHECK OPERATION OF ACTIVE STABILIZER CONVERTER

(a) Connect Techstream to the DLC3.

(b) Turn the engine switch on (IG) and press the Techstream main switch ON.

(c) Clear the DTC Active Stabilizer Suspension System.

(d) Drive the vehicle and check if the problem recurs.

(e) Check for DTC.

OK:

DTC is not output.

OK -- RETURNS TO NORMAL
NG -- Continue to next step.

16. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU

(a) Turn the engine switch off.

(b) Exchange the front active stabilizer control ECU with the rear active stabilizer control ECU.

(c) Connect Techstream to the DLC3.

(d) Turn the engine switch on (IG) and press the Techstream main switch ON.

(e) Clear the DTC Active Stabilizer Suspension System.

(f) Check for DTC.

Result:

B -- REPLACE ACTIVE STABILIZER CONVERTER

A -- REPLACE REAR ACTIVE STABILIZER CONTROL ECU