Active Stabilizer Suspension System (Diagnostic Codes & Symptom Tests): Overview Lexus GS III facelift

DESCRIPTION

The rear active stabilizer control actuator consists of the rotation angle sensor, relay, motor and other parts. If a problem related to the rotation angle sensor or actuator drive function of the rear active stabilizer control actuator or rear active stabilizer control ECU occurs, the DTCs below are output. DTC C1951 is output during Test Mode.

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1. CHECK CONNECTOR CONNECTION CONDITION Turn the engine switch off. Inspect the condition of the connector terminal. OK Connector and terminal are not deformed or damaged. Terminal is not loose or corroded. OK --> See step 3 NG: Go to next step
2. CHECK FOR DTC Repair the connector or terminal. Check for DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Result Result Proceed to DTC is output A DTC is not output B B --> END A: Go to next step
3. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - REAR ACTIVE STABILIZER CONTROL ACTUATOR) Turn the engine switch off. Disconnect the z8 and z10 rear active stabilizer control ECU connector. Disconnect the C rear active stabilizer control actuator (rotation angle sensor) connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition z10-2 (UU) - A-2 (U) Always Below 1 ohms z10-2 (UU) - Body ground Always 10 kohms or higher z10-3 (VV) - A-3 (V) Always Below 1 ohms z10-3 (VV) - Body ground Always 10 kohms or higher z10-1 (WW) - A-1 (W) Always Below 1 ohms z10-1 (WW) - Body ground Always 10 kohms or higher z8-2 (SR) - C-3 (SR) Always Below 1 ohms z8-2 (SR) - Body ground Always 10 kohms or higher z8-7 (SV) - C-12 (SV) Always Below 1 ohms z8-7 (SV) - Body ground Always 10 kohms or higher z8-8 (HA) - C-10 (HA) Always Below 1 ohms z8-8 (HA) - Body ground Always 10 kohms or higher z8-9 (HB) - C-9 (HB) Always Below 1 ohms z8-9 (HB) - Body ground Always 10 kohms or higher z8-1 (HC) - C-6 (HC) Always Below 1 ohms z8-1 (HC) - Body ground Always 10 kohms or higher z8-12 (SG) - C-2 (SG) Always Below 1 ohms z8-12 (SG) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU Exchange the rear active stabilizer control ECU with the front active stabilizer control ECU. Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Check for DTC. Result Result Proceed to DTC C1929, C192A, C192B, C192C, C192E or C1944 is output A DTC C1901, C1902, C1903, C1904, C1906 or C191C is output B A --> See step 5 B --> See step 6
5. REPLACE REAR ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S19789707742011012800000)
6. REPLACE REAR ACTIVE STABILIZER CONTROL ACTUATOR Refer to «REMOVAL»(ref-382575-S24918600832011012800000)

The rear active stabilizer control ECU and front active stabilizer control ECU use CAN communication to perform a mutual system check. If a problem occurs in the rear active stabilizer control ECU, rear active stabilizer control actuator, and PIG power source circuit, DTCs C1905, C1911, C1923 and C1924 are recorded.

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1. INSPECT FUSE (STB RR) Remove the STB RR H-fuse from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition STB RR H-fuse Always Below 1 ohms HINT: When a fuse burns out during installation, there may be a power source-related short. NG --> REPLACE FUSE OK: Go to next step
2. INSPECT REAR ACTIVE STABILIZER RELAY (STB RR) Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE REAR ACTIVE STABILIZER RELAY OK: Go to next step
3. INSPECT FRONT ACTIVE STABILIZER RELAY (STB FR) Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE FRONT ACTIVE STABILIZER RELAY OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (RELAY BLOCK - BATTERY) Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition Relay block rear active stabilizer relay terminal 3 - Body ground Always 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE-RELATED) OK: Go to next step
5. CHECK ACTIVE STABILIZER RELAY CIRCUIT Remove the front and rear active stabilizer relays from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition Relay block rear active stabilizer relay terminal 2 - Front active stabilizer relay terminal 2 Always Below 1 ohms Relay block rear active stabilizer relay terminal 2 or Front active stabilizer relay terminal 2 - Body ground Always 10 kohms or higher Relay block rear active stabilizer relay terminal 1 - Front active stabilizer relay terminal 1 Always Below 1 ohms Relay block rear active stabilizer relay terminal 1 or Front active stabilizer relay terminal 1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE LUGGAGE ROOM RELAY BLOCK OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK) Remove the front and rear active stabilizer relays from the luggage room No. 6 relay block. Disconnect the e1 rear active stabilizer control ECU connector. Disconnect the A49 front active stabilizer control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition e1-4 (PIG) - Relay block rear active stabilizer relay terminal 5 Always Below 1 ohms e1-4 (PIG) or Relay block rear active stabilizer relay terminal 5 - Body ground Always 10 kohms or higher e1-6 (MRH) - Relay block rear active stabilizer relay terminal 1 Always Below 1 ohms e1-6 (MRH) or Relay block rear active stabilizer relay terminal 1 - Body ground Always 10 kohms or higher A49-11 (MRL) - Relay block front active stabilizer relay terminal 2 Always Below 1 ohms A49-11 (MRL) or Relay block front active stabilizer relay terminal 2 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU Turn the engine switch off. Exchange the rear active stabilizer control ECU with the front active stabilizer control ECU. Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Check for DTC. Result Result Proceed to DTC C192D, C194B, C194C or C193B is output A DTC C1905, C1911, C1923 or C1924 is output B B --> See step 9 A --> See step 8
8. REPLACE REAR ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S19789707742011012800000)
9. REPLACE REAR ACTIVE STABILIZER CONTROL ACTUATOR Refer to «REMOVAL»(ref-382575-S24918600832011012800000)

The front active stabilizer control ECU and rear active stabilizer control ECU use CAN communication to perform a mutual system check. If a problem occurs in the wire harness or front active stabilizer control ECU, DTC C1907 is stored.

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1. CHECK HARNESS AND CONNECTOR (CAN COMMUNICATION LINE) Disconnect the A49 front active stabilizer control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition A49-1 (LCN+) - A49-8 (LCN-) Engine switch off 54 to 69 ohms A49-2 (CANH) - A49-3 (CANL) Engine switch off 54 to 69 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (CAN COMMUNICATION LINE) Disconnect the e1 rear active stabilizer control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition e1-1 (LCN+) - e1-8 (LCN-) Engine switch off 54 to 69 ohms e1-2 (CANH) - e1-3 (CANL) Engine switch off 54 to 69 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK OPERATION OF FRONT ACTIVE STABILIZER CONTROL ECU Turn the engine switch off. Exchange the front active stabilizer control ECU with the rear active stabilizer control ECU. Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Check for DTC. Result Result Proceed to DTC is not output A DTC C192F is output B A --> CHECK INTERMITTENT PROBLEMS B --> See step 4
4. REPLACE FRONT ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S11736172032011012800000)

The rear active stabilizer control ECU consists of a metal board, control board, power source IC, step-up circuit, EEPROM, and other parts. If a problem occurs in the rear active stabilizer control ECU, DTCs C1908, C1909, C190A, C190B, C190E, C190F, C1910, C1912 and C1921 are stored.

The rear active stabilizer control ECU consists of a metal board, control board, power source IC, step-up circuit, EEPROM, and other parts. If a problem occurs in the rear active stabilizer control ECU, DTCs C190C and C190D are stored.

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1. INSPECT MULTI-INFORMATION DISPLAY Turn the engine switch on (IG). Check if the multi-information display can display continuously for 30 minutes or more. Result Result Proceed to Displays for 30 minutes or more A Display turns off within 30 minutes B B --> See step 3 A: Go to next step
2. INSPECT SURROUNDING CONDITIONS (AMBIENT TEMPERATURE) Confirm the temperature around the rear active stabilizer control ECU. HINT: If there are factors causing a high temperature in the rear active stabilizer control ECU, eliminate those factors, wait for the ECU to cool down, and recheck for the DTC. Result Result Proceed to Factors causing high temperatures A No factors causing high temperatures B A --> ELIMINATE FACTORS CAUSING HIGH TEMPERATURES B: Go to next step
3. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU Turn the engine switch off. Exchange the rear active stabilizer control ECU with the front active stabilizer ECU. Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Check for DTC. Result Result Proceed to DTC is not output A DTC C1934 or C1935 is output B A --> CHECK INTERMITTENT PROBLEMS B --> See step 4
4. REPLACE REAR ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S19789707742011012800000)

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.

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1. INSPECT SURROUNDING CONDITIONS (AMBIENT TEMPERATURE) 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: Go to next step
2. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - ACTIVE STABILIZER CONVERTER) Disconnect the e1 rear active stabilizer control ECU connector. Disconnect the e4 active stabilizer converter connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition e1-11 (MRL) - e4-8 (BT-) Always Below 1 ohms e1-11 (MRL) or e4-8 (BT-) - Body ground Always 10 kohms or higher e1-10 (DDON) - e4-7 (DDON) Always Below 1 ohms e1-10 (DDON) or e4-7 (DDON) - Body ground Always 10 kohms or higher e1-7 (BT+) - e4-5 (BT+) Always Below 1 ohms e1-7 (BT+) or e4-5 (BT+) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (ACTIVE STABILIZER CONVERTER - BATTERY) Disconnect the e3 active stabilizer converter connector. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition e3-2 (DDLI) - Body ground Always 10 to 14 V e3-1 (DDPB) - Body ground Always 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT BATTERY (for Active Stabilizer) Wait 10 minutes after stopping the engine. 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: Go to next step
5. INSPECT FUSE (STB RR) Remove the STB RR H-fuse from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Tester Connection Condition Specified Condition STB RR H-fuse Always Below 1 ohms HINT: When a fuse burns out during installation, there may be a power source-related short. NG --> REPLACE FUSE OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (RELAY BLOCK - BATTERY) Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition Relay block rear active stabilizer relay terminal 3 - Body ground Always 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. INSPECT REAR ACTIVE STABILIZER RELAY (STB RR) Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE REAR ACTIVE STABILIZER RELAY OK: Go to next step
8. INSPECT FRONT ACTIVE STABILIZER RELAY (STB FR) Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE FRONT ACTIVE STABILIZER RELAY OK: Go to next step
9. CHECK ACTIVE STABILIZER RELAY CIRCUIT Remove the front and rear active stabilizer relays from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition Relay block rear active stabilizer relay terminal 1 - Front active stabilizer relay terminal 1 Always Below 1 ohms Relay block rear active stabilizer relay terminal 1 or front active stabilizer relay terminal 1 - Body ground Always 10 kohms or higher Relay block rear active stabilizer relay terminal 2 - Front active stabilizer relay terminal 2 Always Below 1 ohms Relay block rear active stabilizer relay terminal 2 or front active stabilizer relay terminal 2 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE LUGGAGE ROOM RELAY BLOCK OK: Go to next step
10. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK) Disconnect the e1 rear active stabilizer control ECU connector. Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition e1-4 (PIG) - Relay block rear active stabilizer relay terminal 5 Always Below 1 ohms e1-4 (PIG) or Relay block rear active stabilizer relay terminal 5 - Body ground Always 10 kohms or higher e1-6 (MRH) - Relay block rear active stabilizer relay terminal 1 Always Below 1 ohms e1-6 (MRH) or Relay block rear active stabilizer relay terminal 1 - Body ground Always 10 kohms or higher e1-5 (PGND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (FRONT ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK) Disconnect the A49 front active stabilizer control ECU connector. Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition A49-11 (MRL) - Relay block front active stabilizer relay terminal 2 Always Below 1 ohms A49-11 (MRL) or Relay block rear active stabilizer relay terminal 2 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
12. CHECK FOR DTC Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Drive the vehicle and check if the problem recurs. Check for DTC. OK DTC is not output. OK --> RETURNS TO NORMAL NG: Go to next step
13. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU Turn the engine switch off. Exchange the rear active stabilizer control ECU with the front active stabilizer control ECU. Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Check for DTC. Result Result Proceed to DTC C1939, C193C is output A DTC C1913, C1915, C1928 is output B B --> REPLACE ACTIVE STABILIZER CONVERTER A --> See step 14
14. REPLACE REAR ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S19789707742011012800000)

The front active stabilizer control ECU and rear active stabilizer control ECU communicate through CAN communication (local CAN bus). If a problem occurs in the CAN communication system (local CAN), DTC C1916 is stored.

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1. CHECK HARNESS AND CONNECTOR (CAN COMMUNICATION LINE) Disconnect the A49 front active stabilizer control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition A49-1 (LCN+) - A49-8 (LCN-) Engine switch off 54 to 69 ohms A49-2 (CANH) - A49-3 (CANL) Engine switch off NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (CAN COMMUNICATION LINE) Disconnect the e1 rear active stabilizer control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition e1-1 (LCN+) - e1-8 (LCN-) Engine switch off 54 to 69 ohms e1-2 (CANH) - e1-3 (CANL) Engine switch off NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (CAN COMMUNICATION LINE) Disconnect the A23 power steering ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition A23-1 (CAN+) - A23-8 (CAN-) Engine switch off 54 to 69 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (CAN COMMUNICATION LINE) Disconnect the A40 steering control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition A40-4 (CAN+) - A40-9 (CAN-) Engine switch off 54 to 69 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU Turn the engine switch off. Exchange the front active stabilizer control ECU with the rear active stabilizer control ECU. Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Check for DTC. Result Result Proceed to DTC C193D is output A DTC is not output B B --> CHECK INTERMITTENT PROBLEMS A --> See step 6
6. REPLACE REAR ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S19789707742011012800000)

The active stabilizer suspension system uses CAN communication to gather information necessary for control functions. If a problem occurs in the CAN communication system, DTC C1917 is stored.

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1. CHECK DTC (CAN COMMUNICATION SYSTEM) Check for DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . OK DTC is not output. NG --> CHECK FLOWCHART OF EACH DTC OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (CAN COMMUNICATION LINE) Disconnect the e1 rear active stabilizer control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition e1-1 (LCN+) - e1-8 (LCN-) Engine switch off 54 to 69 ohms e1-2 (CANH) - e1-3 (CANL) Engine switch off NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU Turn the engine switch off. Exchange the front active stabilizer control ECU with the rear active stabilizer control ECU. Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Check for DTC. Result Result Proceed to DTC C193E is output A DTC is not output B B --> CHECK INTERMITTENT PROBLEMS A --> See step 4
4. REPLACE REAR ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S19789707742011012800000)

The active stabilizer suspension system uses CAN communication to gather information necessary for control functions. When a malfunction occurs in another system, DTCs C1918, C1919, C191A, C191B and C191E are stored.

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.

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1. CHECK VEHICLE CONDITION 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: Go to next step
2. INSPECT ACTIVE STABILIZER BATTERY CURRENT SENSOR Turn the engine switch off. Disconnect the E active stabilizer battery current sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 2 (BSV) - 4 (BSG) Always 3 to 10 kohms 2 (BSV) - 3 (BSC) Always Below 0.5 kohms 3 (BSC) - 4 (BSG) Always 3 to 10 kohms 1 (BST) - 4 (BSG) Always 1.5 to 2.5 kohms NG --> REPLACE ACTIVE STABILIZER CURRENT SENSOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - ACTIVE STABILIZER BATTERY CURRENT SENSOR) Disconnect the z8 rear active stabilizer control ECU connector. Disconnect the E active stabilizer battery current sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition z8-4 (BSC) - E-3 (BSC) Always Below 1 ohms z8-4 (BSC) or E-3 (BSC) - Body ground Always 10 kohms or higher z8-3 (BSV) - E-2 (BSV) Always Below 1 ohms z8-3 (BSV) or E-2 (BSV) - Body ground Always 10 kohms or higher z8-6 (BSG) - E-4 (BSG) Always Below 1 ohms z8-6 (BSG) or E-4 (BSG) - Body ground Always 10 kohms or higher z8-5 (BST) - E-1 (BST) Always Below 1 ohms z8-5 (BST) or E-1 (BST) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK SURROUNDING CONDITIONS (AMBIENT TEMPERATURE) Check the ambient temperature of the active stabilizer converter. OK No factors causing high temperatures NG --> ELIMINATE FACTORS CAUSING HIGH TEMPERATURES OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - ACTIVE STABILIZER CONVERTER) Disconnect the e1 rear active stabilizer control ECU connector. Disconnect the e4 active stabilizer converter connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition e1-7 (BT+) - e4-5 (BT+) Always Below 1 ohms e1-7 (BT+) or e4-5 (BT+) - Body ground Always 10 kohms or higher e1-10 (DDON) - e4-7 (DDON) Always Below 1 ohms e1-10 (DDON) or e4-7 (DDON) - Body ground Always 10 kohms or higher e1-11 (MRL) - e4-8 (BT-) Always Below 1 ohms e1-11 (MRL) or e4-8 (BT-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (ACTIVE STABILIZER CONVERTER - BATTERY) Disconnect the e3 active stabilizer converter connector. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition e3-2 (DDLI) - Body ground Always 11 to 14 V e3-1 (DDPB) - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. INSPECT BATTERY (for Active Stabilizer) Wait 10 minutes after stopping the engine. 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: Go to next step
8. INSPECT FUSE (STB RR) Remove the STB RR H-fuse from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Tester Connection Condition Specified Condition STB RR H-fuse Always Below 1 ohms NG --> CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE OK: Go to next step
9. CHECK HARNESS AND CONNECTOR (RELAY BLOCK - BATTERY) Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition Relay block rear active stabilizer relay terminal 3 - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
10. INSPECT REAR ACTIVE STABILIZER RELAY (Marking: STB RR) Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE ACTIVE STABILIZER RELAY OK: Go to next step
11. INSPECT FRONT ACTIVE STABILIZER RELAY (Marking: STB FR) Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE FRONT ACTIVE STABILIZER RELAY OK: Go to next step
12. CHECK ACTIVE STABILIZER RELAY CIRCUIT Remove the front and rear active stabilizer relays from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition Relay block rear active stabilizer relay terminal 1 - Front active stabilizer relay terminal 1 Always Below 1 ohms Relay block rear active stabilizer relay terminal 1 or front active stabilizer relay terminal 1 - Body ground Always 10 kohms or higher Relay block rear active stabilizer relay terminal 2 - Front active stabilizer relay terminal 2 Always Below 1 ohms Relay block rear active stabilizer relay terminal 2 or front active stabilizer relay terminal 2 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE LUGGAGE ROOM RELAY BLOCK OK: Go to next step
13. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK) Disconnect the e1 rear active stabilizer control ECU connector. Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition e1-4 (PIG) - Relay block rear active stabilizer relay terminal 5 Always Below 1 ohms e1-4 (PIG) or Relay block rear active stabilizer relay terminal 5 - Body ground Always 10 kohms or higher e1-6 (MRH) - Relay block rear active stabilizer relay terminal 1 Always Below 1 ohms e1-6 (MRH) or Relay block rear active stabilizer relay terminal 1 - Body ground Always 10 kohms or higher e1-5 (PGND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
14. CHECK HARNESS AND CONNECTOR (FRONT ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK) Disconnect the A49 front active stabilizer control ECU connector. Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition A49-11 (MRL) - Relay block front active stabilizer relay terminal 2 Always Below 1 ohms A49-11 (MRL) or Relay block rear active stabilizer relay terminal 2 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
15. CHECK OPERATION OF ACTIVE STABILIZER CONVERTER Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Drive the vehicle and check if the problem recurs. Check for DTC. OK DTC is not output. OK --> RETURNS TO NORMAL NG: Go to next step
16. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU Turn the engine switch off. Exchange the front active stabilizer control ECU with the rear active stabilizer control ECU. Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Check for DTC. Result Result Proceed to DTC is not output A DTC C1925 or C194E is output B B --> REPLACE ACTIVE STABILIZER CONVERTER A --> See step 17
17. REPLACE REAR ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S19789707742011012800000)

The rear active stabilizer control ECU uses the battery current sensor installed on the battery (for active stabilizer) to monitor the temperature and current of the battery (for active stabilizer). If a problem occurs in the active stabilizer battery current sensor, DTCs C1926 and C1927 are stored.

Scheme 120

Scheme 121

1. INSPECT ACTIVE STABILIZER BATTERY CURRENT SENSOR Turn the engine switch off. Disconnect the E active stabilizer battery current sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 2 (BSV) - 4 (BSG) Always 3 to 10 kohms 2 (BSV) - 3 (BSC) Always Below 0.5 kohms 3 (BSC) - 4 (BSG) Always 3 to 10 kohms 1 (BST) - 4 (BSG) Always 1.5 to 2.5 kohms NG --> REPLACE ACTIVE STABILIZER BATTERY CURRENT SENSOR OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - ACTIVE STABILIZER BATTERY CURRENT SENSOR) Disconnect the z8 rear active stabilizer control ECU connector. Disconnect the E active stabilizer battery current sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition z8-4 (BSC) - E-3 (BSC) Always Below 1 ohms z8-4 (BSC) or E-3 (BSC) - Body ground Always 10 kohms or higher z8-3 (BSV) - E-2 (BSV) Always Below 1 ohms z8-3 (BSV) or E-2 (BSV) - Body ground Always 10 kohms or higher z8-6 (BSG) - E-4 (BSG) Always Below 1 ohms z8-6 (BSG) or E-4 (BSG) - Body ground Always 10 kohms or higher z8-5 (BST) - E-1 (BST) Always Below 1 ohms z8-5 (BST) or E-1 (BST) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 3
3. REPLACE REAR ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S19789707742011012800000)

The front active stabilizer control actuator consists of the rotation angle sensor, relay, motor and other parts. If a problem related to the rotation angle sensor or actuator drive function of the front active stabilizer control actuator or front active stabilizer control ECU occurs, the DTCs below are output. DTC C1950 is output during Test Mode.

Scheme 122

Scheme 123

1. CHECK CONNECTOR CONNECTION CONDITION Turn the engine switch off. Inspect the condition of the connector terminal. OK Connector and terminal are not deformed or damaged. Terminal is not loose or corroded. OK --> See step 3 NG: Go to next step
2. CHECK DTC Repair the connector or terminal. Check for DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Result Result Proceed to DTC is output A DTC is not output B B --> END A: Go to next step
3. CHECK HARNESS AND CONNECTOR (FRONT ACTIVE STABILIZER CONTROL ECU - FRONT ACTIVE STABILIZER CONTROL ACTUATOR) Turn the engine switch off. Disconnect the z7 and z9 front active stabilizer control ECU connector. Disconnect the D front active stabilizer control actuator (rotation angle sensor) connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition z9-2 (UU) - B-2 (U) Always Below 1 ohms z9-2 (UU) - Body ground Always 10 kohms or higher z9-3 (VV) - B-3 (V) Always Below 1 ohms z9-3 (VV) - Body ground Always 10 kohms or higher z9-1 (WW) - B-1 (W) Always Below 1 ohms z9-1 (WW) - Body ground Always 10 kohms or higher z7-2 (SR) - D-3 (SR) Always Below 1 ohms z7-2 (SR) - Body ground Always 10 kohms or higher z7-7 (SV) - D-12 (SV) Always Below 1 ohms z7-7 (SV) - Body ground Always 10 kohms or higher z7-8 (HA) - D-10 (HA) Always Below 1 ohms z7-8 (HA) - Body ground Always 10 kohms or higher z7-9 (HB) - D-9 (HB) Always Below 1 ohms z7-9 (HB) - Body ground Always 10 kohms or higher z7-1 (HC) - D-6 (HC) Always Below 1 ohms z7-1 (HC - Body ground Always 10 kohms or higher z7-12(SG) - D-2 (SG) Always Below 1 ohms z7-12(SG) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK OPERATION OF FRONT ACTIVE STABILIZER CONTROL ECU Turn the engine switch off. Exchange the front active stabilizer control ECU with the rear active stabilizer control ECU. Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Check for DTC. Result Result Proceed to DTC C1929, C192A, C192B, C192C, C192E or C1944 is output A DTC C1901, C1902, C1903, C1904, C1906 or C191C is output B A --> See step 5 B --> See step 6
5. REPLACE FRONT ACTIVE STABILIZER CONTROL ACTUATOR Refer to «REMOVAL»(ref-382575-S30294967332011012800000)
6. REPLACE FRONT ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S11736172032011012800000)

The rear active stabilizer control ECU and front active stabilizer control ECU use CAN communication to perform a mutual system check. If a problem occurs in the rear active stabilizer control ECU, rear active stabilizer control actuator, and PIG power source circuit, DTCs C192D, C193B, C194B and C194C are stored.

Scheme 124

1. INSPECT FUSE (STB FR) Remove the STB FR H-fuse from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition STB FR H-fuse Always Below 1 ohms HINT: When a fuse burns out during installation, there may be a power source-related short. NG --> REPLACE FUSE OK: Go to next step
2. INSPECT FRONT ACTIVE STABILIZER RELAY (STB FR) Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE FRONT ACTIVE STABILIZER RELAY OK: Go to next step
3. INSPECT REAR ACTIVE STABILIZER RELAY (STB RR) Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE REAR ACTIVE STABILIZER RELAY OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (POWER SOURCE-RELATED) Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition Relay block front active stabilizer relay terminal 3 - Body ground Always 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK ACTIVE STABILIZER RELAY CIRCUIT Remove the front and rear active stabilizer relays from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition Relay block rear active stabilizer relay terminal 2 - Front active stabilizer relay terminal 2 Always Below 1 ohms Relay block rear active stabilizer relay terminal 2 or Front active stabilizer relay terminal 2 - Body ground Always 10 kohms or higher Relay block rear active stabilizer relay terminal 1 - Front active stabilizer relay terminal 1 Always Below 1 ohms Relay block rear active stabilizer relay terminal 1 or Front active stabilizer relay terminal 1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE LUGGAGE ROOM RELAY BLOCK OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (FRONT ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK) Remove the front and rear active stabilizer relay from the luggage room No. 6 relay block. Disconnect the e1 rear active stabilizer control ECU connector. Disconnect the A49 front active stabilizer control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition A49-4 (PIG) - Relay block front active stabilizer relay terminal 5 Always Below 1 ohms A49-4 (PIG) or Relay block front active stabilizer relay terminal 5 - Body ground Always 10 kohms or higher A49-11 (MRL) - Relay block front active stabilizer relay terminal 2 Always Below 1 ohms A49-11 (MRL) or Relay block front active stabilizer relay terminal 2 - Body ground Always 10 kohms or higher e1-6 (MRH) - Relay block rear active stabilizer relay terminal 1 Always Below 1 ohms e1-6 (MRH) or Relay block rear active stabilizer relay terminal 1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK OPERATION OF FRONT ACTIVE STABILIZER CONTROL ECU Turn the engine switch off. Exchange the rear active stabilizer control ECU with the front active stabilizer control ECU. Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Check for DTC. Result Result Proceed to DTC C192D, C193B, C194B or C194C is output A DTC C1905, C1911, C1923 or C1924 is output B B --> See step 8 A --> See step 9
8. REPLACE FRONT ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S11736172032011012800000)
9. REPLACE FRONT ACTIVE STABILIZER CONTROL ACTUATOR Refer to «REMOVAL»(ref-382575-S30294967332011012800000)

The front active stabilizer control ECU and rear active stabilizer control ECU use CAN communication to perform a mutual system check. If a problem occurs in the wire harness or front active stabilizer control ECU, DTC C192F is stored.

Scheme 125

The front active stabilizer control ECU consists of a metal board, control board, power source IC, step-up circuit, EEPROM, and other parts. If a problem occurs in the front active stabilizer control ECU and PIG power source circuit, DTCs C1930, C1931, C1932, C1933, C1936, C1937, C1938 and C193A are stored.

Scheme 126

Scheme 127

1. INSPECT FUSE (STB FR) Remove the STB FR H-fuse from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition STB FR H-fuse Always Below 1 ohms HINT: When a fuse burns out during installation, there may be a power source-related short. NG --> REPLACE FUSE OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (RELAY BLOCK - BATTERY) Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition Relay block front active stabilizer relay terminal 3 - Body ground Always 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT FRONT ACTIVE STABILIZER RELAY (STB FR) Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE FRONT ACTIVE STABILIZER RELAY OK: Go to next step
4. INSPECT REAR ACTIVE STABILIZER RELAY (STB RR) Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE REAR ACTIVE STABILIZER RELAY OK: Go to next step
5. CHECK ACTIVE STABILIZER RELAY CIRCUIT Remove the front and rear active stabilizer relays from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition Relay block rear active stabilizer relay terminal 1 - Front active stabilizer relay terminal 1 Always Below 1 ohms Relay block rear active stabilizer relay terminal 1 or front active stabilizer relay terminal 1 - Body ground Always 10 kohms or higher Relay block rear active stabilizer relay terminal 2 - Front active stabilizer relay terminal 2 Always Below 1 ohms Relay block rear active stabilizer relay terminal 2 or front active stabilizer relay terminal 2 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE LUGGAGE ROOM RELAY BLOCK OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (FRONT ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK) Disconnect the A49 front active stabilizer control ECU connector. Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition A49-4 (PIG) - Relay block front active stabilizer relay terminal 5 Always Below 1 ohms A49-4 (PIG) or Relay block front active stabilizer relay terminal 5 - Body ground Always 10 kohms or higher A49-11(MRL) - Relay block front active stabilizer relay terminal 2 Always Below 1 ohms A49-11 (MRL) or Relay block front active stabilizer relay terminal 2 - Body ground Always 10 kohms or higher A49-5 (PGND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK) Disconnect the e1 rear active stabilizer control ECU connector. Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition e1- 6 (MRH) - Relay block rear active stabilizer relay terminal 1 Always Below 1 ohms e1-6 (MRH) or Relay block rear active stabilizer relay terminal 1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. CHECK OPERATION OF FRONT ACTIVE STABILIZER CONTROL ECU Turn the engine switch off. Exchange the rear active stabilizer control ECU with the front active stabilizer control ECU. Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Check for DTC. Result Result Proceed to DTC C1908, C1909, C190A, C190B, C190E, C190F, C1910, C1912 or C1921 is output A DTC is not output B NG --> CHECK INTERMITTENT PROBLEMS A --> See step 9
9. REPLACE FRONT ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S11736172032011012800000)

The front active stabilizer control ECU consists of a metal board, control board, power source IC, step-up circuit, EEPROM, and other parts. If a problem occurs in the front active stabilizer control ECU, DTCs C1934 and C1935 are stored.

The active stabilizer converter supplies operating power to the front active stabilizer control ECU from the front 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 front active stabilizer control ECU, active stabilizer converter, battery (for active stabilizer) and PIG power source circuit, DTCs C1939 and C193C are stored.

Scheme 128

1. INSPECT SURROUNDING CONDITIONS (AMBIENT TEMPERATURE) 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: Go to next step
2. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - ACTIVE STABILIZER CONVERTER) Disconnect the e1 rear active stabilizer control ECU connector. Disconnect the e4 active stabilizer converter connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition e1-11 (MRL) - e4-8 (BT-) Always Below 1 ohms e1-11 (MRL) or e4-8 (BT-) - Body ground Always 10 kohms or higher e1-10 (DDON) - e4-7 (DDON) Always Below 1 ohms e1-10 (DDON) or e4-7 (DDON) - Body ground Always 10 kohms or higher e1-7 (BT+) - e4-5 (BT+) Always Below 1 ohms e1-7 (BT+) or e4-5 (BT+) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (ACTIVE STABILIZER CONVERTER - BATTERY) Disconnect the e3 active stabilizer converter connector. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition e3-2 (DDLI) - Body ground Always 10 to 14 V e3-1 (DDPB) - Body ground Always 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT BATTERY (for Active Stabilizer) Wait 10 minutes after stopping the engine. 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: Go to next step
5. INSPECT FUSE (STB FR) Remove the STB FR H-fuse from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition STB FR H-fuse Always Below 1 ohms HINT: When a fuse burns out during installation, there may be a power source-related short. NG --> REPLACE FUSE OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (RELAY BLOCK - BATTERY) Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition Relay block front active stabilizer relay terminal 3 - Body ground Always 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. INSPECT FRONT ACTIVE STABILIZER RELAY (STB FR) Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE FRONT ACTIVE STABILIZER RELAY OK: Go to next step
8. INSPECT REAR ACTIVE STABILIZER RELAY (STB RR) Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE REAR ACTIVE STABILIZER RELAY OK: Go to next step
9. CHECK ACTIVE STABILIZER RELAY CIRCUIT Remove the front and rear active stabilizer relays from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition Relay block rear active stabilizer relay terminal 1 - Front active stabilizer relay terminal 1 Always Below 1 ohms Relay block rear active stabilizer relay terminal 1 or front active stabilizer relay terminal 1 - Body ground Always 10 kohms or higher Relay block rear active stabilizer relay terminal 2 - Front active stabilizer relay terminal 2 Always Below 1 ohms Relay block rear active stabilizer relay terminal 2 or front active stabilizer relay terminal 2 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE LUGGAGE ROOM RELAY BLOCK OK: Go to next step
10. CHECK HARNESS AND CONNECTOR (FRONT ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK) Disconnect the A49 front active stabilizer control ECU connector. Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition A49-4 (PIG) - Relay block rear active stabilizer relay terminal 5 Always Below 1 ohms A49-4 (PIG) or Relay block rear active stabilizer relay terminal 5 - Body ground Always 10 kohms or higher A49-11 (MRL) - Relay block front active stabilizer relay terminal 2 Always Below 1 ohms A49-11 (MRL) or Relay block front active stabilizer relay terminal 2 - Body ground Always 10 kohms or higher A49-5 (PGND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK) Disconnect the e1 rear active stabilizer control ECU connector. Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition e1-6 (MRH) - Relay block rear active stabilizer relay terminal 1 Always Below 1 ohms e1-6 (MRH) or Relay block front active stabilizer relay terminal 1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
12. CHECK DTC Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Drive the vehicle and check if the problem recurs. Check for DTC. OK DTC is not output. OK --> RETURNS TO NORMAL NG: Go to next step
13. CHECK OPERATION OF FRONT ACTIVE STABILIZER CONTROL ECU Turn the engine switch off. Exchange the rear active stabilizer control ECU with the front active stabilizer control ECU. Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC. Check for DTC. Result Result Proceed to DTC C1939 or C193C is output A DTC C1915 or C1928 is output B A --> REPLACE ACTIVE STABILIZER CONVERTER B --> See step 14
14. REPLACE FRONT ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S11736172032011012800000)

The front active stabilizer control ECU and rear active stabilizer control ECU communicate through CAN communication (local CAN bus). If a problem occurs in the CAN communication system (local CAN), DTC C193D is stored.

Scheme 129

Scheme 130

Scheme 131

Scheme 132

Scheme 133

Scheme 134

1. INSPECT ACTIVE STABILIZER BATTERY CURRENT SENSOR Turn the engine switch off. Disconnect the E active stabilizer battery current sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 2 (BSV) - 4 (BSG) Always 3 to 10 kohms 2 (BSV) - 3 (BSC) Always Below 0.5 kohms 3 (BSC) - 4 (BSG) Always 3 to 10 kohms 1 (BST) - 4 (BSG) Always 1.5 to 2.5 kohms NG --> REPLACE ACTIVE STABILIZER BATTERY CURRENT SENSOR OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (REAR ACTIVE STABILIZER CONTROL ECU - ACTIVE STABILIZER BATTERY CURRENT SENSOR) Disconnect the z10 rear active stabilizer control ECU connector. Disconnect the E active stabilizer battery current sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition z10-4 (BSC) - E-3 (BSC) Always Below 1 ohms z10-4 (BSC) or E-3 (BSC) - Body ground Always 10 kohms or higher z10-3 (BSV) - E-2 (BSV) Always Below 1 ohms z10-3 (BSV) or E-2 (BSV) - Body ground Always 10 kohms or higher z10-6 (BSG) - E-4 (BSG) Always Below 1 ohms z10-6 (BSG) or E-4 (BSG) - Body ground Always 10 kohms or higher z10-5 (BST) - E-1 (BST) Always Below 1 ohms z10-5 (BST) or E-1 (BST) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (CAN COMMUNICATION LINE) Disconnect the A49 front active stabilizer control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition A49-1 (LCN+) - A49-8 (LCN-) Engine switch off 54 to 69 ohms A49-2 (CANH) - A49-3 (CANL) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (CAN COMMUNICATION LINE) Disconnect the e1 rear active stabilizer control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition e1-1 (LCN+) - e1-8 (LCN-) Engine switch off 54 to 69 ohms e1-2 (CANH) - e1-3 (CANL) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (CAN COMMUNICATION LINE) Disconnect the A23 power steering ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition A23-1 (CAN+) - A23-8 (CAN-) Engine switch off 54 to 69 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (CAN COMMUNICATION LINE) Disconnect the A40 steering control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition A40-4 (CAN+) - A40-9 (CAN-) Engine switch off 54 to 69 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK OPERATION OF FRONT ACTIVE STABILIZER CONTROL ECU Turn the engine switch off. Exchange the front active stabilizer control ECU with the rear active stabilizer control ECU. Connect Techstream to the DLC3. Turn the engine switch on (IG) and press the Techstream main switch ON. Clear the DTC Refer to «DTC CHECK / CLEAR»(ref-382800-S29292824702011012800000) . Check for DTC. Result Result Proceed to DTC C1916 is output A DTC is not output B A --> CHECK INTERMITTENT PROBLEMS B --> See step 8
8. REPLACE FRONT ACTIVE STABILIZER CONTROL ECU Refer to «REMOVAL»(ref-382798-S11736172032011012800000)

The active stabilizer suspension system uses CAN communication to gather information necessary for control functions. If a problem occurs in the CAN communication system, DTC C193E is stored.

The active stabilizer suspension system uses CAN communication to gather information necessary for control functions. When a malfunction occurs in another system, DTCs C1940, C1941, C1942, C1943 and C1946 are stored.

This DTC is output when the test mode inspection ends despite it being incomplete.

The active stabilizer suspension system uses CAN communication to gather information necessary for control functions. When a system's signal is disrupted, DTCs U0100, U0122, U0123, U0126, U0130 and U0132 are output.

This troubleshooting procedure is conducted to determine if the active stabilizer suspension system is the cause of the problem.