C1928

SUSPENSION CONTROL: ACTIVE STABILIZER SUSPENSION SYSTEM: C1913: Rear Boosted Voltage

DTC C1913 - Rear Boosted Voltage

DTC C1915 - Rear PIG Power Supply Voltage

DTC C1928 - Malfunction in DC/DC Converter

DESCRIPTION

The active stabilizer converter supplies operating power to the rear active stabilizer control ECU from the rear active stabilizer control actuator. Also, when the battery (for active stabilizer) voltage is low, the active stabilizer converter charges it. If a problem occurs in the rear active stabilizer control ECU, rear active stabilizer control actuator, battery (for active stabilizer) and PIG power source circuit, DTCs C1913, C1915 and C1928 are stored.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT SURROUNDING CONDITIONS (AMBIENT TEMPERATURE)
(a) Check the ambient temperature of the active stabilizer converter.
OK:
No factors causing high temperatures
HINT: If there are any factors causing high temperatures, excluding parts of the active stabilizer, eliminate them. After eliminating them, allow the active stabilizer to cool down and recheck for a DTC.

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

2. 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.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






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

3. 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.

4. 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.
NOTE:
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.

5. 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.
:





HINT: When a fuse burns out during installation, there may be a power source-related short.

NG -- REPLACE FUSE
OK -- Continue to next step.

6. 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.

7. INSPECT REAR ACTIVE STABILIZER RELAY (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 REAR ACTIVE STABILIZER RELAY
OK -- Continue to next step.

8. INSPECT FRONT ACTIVE STABILIZER RELAY (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.

9. 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.

10. 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.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






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

11. 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.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






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

12. CHECK FOR DTC
(a) Clear the DTC Active Stabilizer Suspension System.
(b) Drive the vehicle and check if the problem recurs.
(c) Check for DTC.
OK:
DTC is not output.
OK -- RETURNS TO NORMAL
NG -- Continue to next step.

13. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU
(a) Turn the engine switch off.
(b) Exchange the rear active stabilizer control ECU with the front 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