Active Stabilizer Suspension System (Diagnostic Codes & Symptom Tests): Other Lexus GS III рестайлинг

PROCEDURE

1. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU Turn the power switch OFF. Exchange the rear active stabilizer control ECU with the front active stabilizer control ECU. Connect Techstream to the DLC3. Turn the power switch ON (IG) and press the Techstream main switch ON. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . Check for DTC. RESULT Result Proceed to DTC is not output A DTC C1930, C1931, C1932, C1933, C1936, C1937, C1938 or C193A is output B A --> CHECK INTERMITTENT PROBLEMS B --> REPLACE REAR ACTIVE STABILIZER CONTROL ECU

1. CHECK DTC (CAN COMMUNICATION SYSTEM) Check for DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . OK DTC is not output. NG --> CHECK FLOWCHART OF EACH DTC OK: Go to next step
2. CHECK WIRE HARNESS (CAN COMMUNICATION LINE) Disconnect the y1 rear active stabilizer control ECU connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition y1-1 (LCN+) - y1-8 (LCN-) 54 to 69 ohms y1-2 (CANH) - y1-3 (CANL) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU Turn the power switch OFF. Exchange the front active stabilizer control ECU with the rear active stabilizer control ECU. Connect Techstream to the DLC3. Turn the power switch ON (IG) and press the Techstream main switch ON. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . Check for DTC. RESULT Result Proceed to DTC C193E is output A DTC is not output B B --> CHECK INTERMITTENT PROBLEMS A --> REPLACE REAR ACTIVE STABILIZER CONTROL ECU

1. CHECK DTC Check for DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . OK DTCs other than C1918, C1919, C191A, C191B and C191E are not output NG --> CHECK FLOWCHART OF EACH DTC OK: Go to next step
2. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU Turn the power switch OFF. Exchange the rear active stabilizer control ECU with the front active stabilizer control ECU. Connect Techstream to the DLC3. Turn the power switch ON (IG) and press the Techstream main switch ON. Clear the DTC. Check for DTC. RESULT Result Proceed to DTC C1940, C1941, C1942, C1943 or C1946 is output A DTC is not output B B --> CHECK INTERMITTENT PROBLEMS A --> REPLACE REAR ACTIVE STABILIZER CONTROL ECU

1. CHECK WIRE HARNESS (CAN COMMUNICATION) Disconnect the y1 rear active stabilizer control ECU connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition y1-1 (LCN+) - y1-8 (LCN-) 54 to 69 ohms y1-2 (CANH) - y1-3 (CANL) 54 to 69 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. CHECK WIRE HARNESS (CAN COMMUNICATION) Disconnect the A58 front active stabilizer control ECU connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition A58-1 (LCN+) - A58-8 (LCN-) 54 to 69 ohms A58-2 (CANH) - A58-3 (CANL) 54 to 69 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK OPERATION OF REAR ACTIVE STABILIZER CONTROL ECU Turn the power switch OFF. Exchange the front active stabilizer control ECU with the rear active stabilizer control ECU. Connect Techstream to the DLC3. Turn the power switch ON (IG) and press the Techstream main switch ON. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . Check for DTC. RESULT Result Proceed to DTC is not output A DTC C1907 is output B A --> CHECK INTERMITTENT PROBLEMS B --> REPLACE REAR ACTIVE STABILIZER CONTROL ECU

1. INSPECT MULTI INFORMATION DISPLAY Turn the power 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. CHECK SURROUNDING CONDITIONS (AMBIENT TEMPERATURE) Confirm the temperature around the front active stabilizer control ECU. HINT: If there are factors causing a high temperature in the front 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 FRONT ACTIVE STABILIZER CONTROL ECU Turn the power switch OFF. Exchange the rear active stabilizer control ECU with the front active stabilizer ECU. Connect Techstream to the DLC3. Turn the power switch ON (IG) and press the Techstream main switch ON. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . Check for DTC. RESULT Result Proceed to DTC is not output A DTC C190C or C190D is output B A --> CHECK INTERMITTENT PROBLEMS B --> REPLACE FRONT ACTIVE STABILIZER CONTROL ECU

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 WIRE HARNESS (REAR ACTIVE STABILIZER CONTROL ECU - ACTIVE STABILIZER CONVERTER) Disconnect the y1 rear active stabilizer control ECU connector. Disconnect the y4 active stabilizer converter connector. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition y1-11 (MRL) - y4-8 (BT-) Below 1 ohms y1-11 (MRL) or y4-8 (BT-) - Body ground 10 kohms or higher y1-10 (DDON) - y4-7 (DDON) Below 1 ohms y1-10 (DDON) or y4-7 (DDON) - Body ground 10 kohms or higher y1-7 (BT+) - y4-5 (BT+) Below 1 ohms y1-7 (BT+) or y4-5 (BT+) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK WIRE HARNESS (ACTIVE STABILIZER CONVERTER - BATTERY) Disconnect the y3 active stabilizer converter connector. Measure the voltage of the wire harness side connector. Standard voltage Tester Connection Specified Condition y3-2 (DDLI) - Body ground 10 to 14 V y3-1 (DDPB) - Body ground 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 of the H-fuse. Standard resistance 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 WIRE HARNESS (RELAY BLOCK - BATTERY) Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the voltage of the relay block. Standard voltage Tester Connection Specified Condition Relay block front active stabilizer relay terminal 3 - Body ground 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. 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 of the relay. Standard resistance Tester Connection Specified Condition 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) NG --> REPLACE FRONT ACTIVE STABILIZER RELAY OK: Go to next step
8. 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 of the relay. Standard resistance Tester Connection Specified Condition 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) 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 of the relay block. Standard resistance Tester Connection Specified Condition Relay block rear active stabilizer relay terminal 1 - Front active stabilizer relay terminal 1 Below 1 ohms Relay block rear active stabilizer relay terminal 1 or front active stabilizer relay terminal 1 - Body ground 10 kohms or higher Relay block rear active stabilizer relay terminal 2 - Front active stabilizer relay terminal 2 Below 1 ohms Relay block rear active stabilizer relay terminal 2 or front active stabilizer relay terminal 2 - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE LUGGAGE ROOM RELAY BLOCK OK: Go to next step
10. CHECK WIRE HARNESS (FRONT ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK) Disconnect the A58 front active stabilizer control ECU connector. Remove the front active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition A58-4 (PIG) - Relay block front active stabilizer relay terminal 5 Below 1 ohms A58-4 (PIG) or Relay block front active stabilizer relay terminal 5 - Body ground 10 kohms or higher A58-11 (MRL) - Relay block front active stabilizer relay terminal 2 Below 1 ohms A58-11 (MRL) or Relay block front active stabilizer relay terminal 2 - Body ground 10 kohms or higher A58-5 (PGND) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
11. CHECK WIRE HARNESS (REAR ACTIVE STABILIZER CONTROL ECU - RELAY BLOCK) Disconnect the y1 rear active stabilizer control ECU connector. Remove the rear active stabilizer relay from the luggage room No. 6 relay block. Measure the resistance of the wire harness side connectors. Standard resistance Tester Connection Specified Condition y1-6 (MRH) - Relay block rear active stabilizer relay terminal 1 Below 1 ohms y1-6 (MRH) or Relay block rear active stabilizer relay terminal 1 - Body ground 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-386966-S21674868462011022400000) . 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 power switch OFF. Exchange the rear active stabilizer control ECU with the front active stabilizer control ECU. Connect Techstream to the DLC3. Turn the power 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 --> REPLACE FRONT ACTIVE STABILIZER CONTROL ECU

1. CHECK DTC Check for DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . OK DTC is not output. NG --> CHECK FLOWCHART OF EACH DTC OK: Go to next step
2. CHECK WIRE HARNESS (CAN COMMUNICATION LINE) Disconnect the A58 front active stabilizer control ECU connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition A58-1 (LCN+) - A58-8 (LCN-) 54 to 69 ohms A58-2 (CANH) - A58-3 (CANL) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK OPERATION OF FRONT ACTIVE STABILIZER CONTROL ECU Turn the power switch OFF position. Exchange the front active stabilizer control ECU with the rear active stabilizer control ECU. Connect Techstream to the DLC3. Turn the power switch ON (IG) and press the Techstream main switch ON. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . Check for DTC. RESULT Result Proceed to DTC C1917 is output A DTC is not output B B --> CHECK INTERMITTENT PROBLEMS A --> REPLACE FRONT ACTIVE STABILIZER CONTROL ECU

1. CHECK DTC Check for DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . OK DTCs other than C1940, C1941, C1942, C1943 and C1946 are not output NG --> CHECK FLOWCHART OF EACH DTC OK: Go to next step
2. CHECK OPERATION OF FRONT ACTIVE STABILIZER CONTROL ECU Turn the power switch OFF. Exchange the rear active stabilizer control ECU with the front active stabilizer control ECU. Connect Techstream to the DLC3. Turn the power switch ON (IG) and press the Techstream main switch ON. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . Check for DTC. RESULT Result Proceed to DTC C1918, C1919, C191A, C191B or C191E is output A DTC is not output B B --> CHECK INTERMITTENT PROBLEMS A --> REPLACE FRONT ACTIVE STABILIZER CONTROL ECU

1. CHECK DTC (CAN COMMUNICATION) Check for DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . OK DTC is not output. NG --> PROCEED TO DTC FLOWCHART OK --> See next step
2. PERFORM TEST MODE AGAIN. Refer to «TEST MODE PROCEDURE»(ref-386966-S21850258732011022400000)

1. CHECK FOR DTC Check for DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . Result Result Proceed to DTC is output A DTC is not output B B --> CHECK INTERMITTENT PROBLEMS A --> See next step
2. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-387091-S07682503522011022400000)

1. INSPECT ACTIVE STABILIZER INSTALLATION CONDITION Inspect the installation conditions of the front and rear active stabilizer control actuators. OK Installed securely (no looseness or rattling). NG --> REPAIR LOOSENESS OR RATTLING, OR REPLACE STABILIZER OK: Go to next step
2. CONFIRM PHENOMENON (FAIL-SAFE MODE) Turn the power switch OFF. Disconnect the rear active stabilizer control ECU connector and put the vehicle in fail-safe mode. While in fail-safe mode, perform the driving test and check if the noise recurs from the same areas of the vehicle. RESULT Result Proceed to Noise recurs A Noise does not recur B B --> See step 4 A: Go to next step
3. CONFIRM PHENOMENON (STABILIZER LINK) Disconnect the rear active stabilizer control ECU connector and put the vehicle in fail-safe mode. Remove one side of the stabilizer link. For the front side, refer to the following procedures. Refer to «REMOVAL - Step 3»(ref-386957-S25248167712011022400000) . For the rear side, refer to the following procedures. Refer to «REMOVAL - Step 3»(ref-386957-S00001560762011022400000) . HINT: One side of the stabilizer link is removed to reduce strain on the link when it experiences a shock or impact on the road. With one side of the stabilizer link removed, perform the driving test and check if the noise recurs from the same areas of the vehicle. NOTE: The driving test must be performed in fail-safe mode. If the test is conducted in the normal mode, the stabilizer bar will move and damage nearby parts. RESULT Result Proceed to Noise does not recur A Noise recurs B B --> REPLACE ACTIVE STABILIZER CONTROL ACTUATOR (ON SIDE WHERE NOISE OCCURS) A: Go to next step
4. CHECK OPERATION OF ACTIVE STABILIZER CONTROL ECU Turn the power switch OFF. Exchange the front active stabilizer control ECU with the rear active stabilizer control ECU. Restore the vehicle to its original state. Connect the Techstream to the DLC3. Turn the power switch ON (IG) and press the Techstream main switch ON. Clear the DTC. Perform the driving test and check if the noise recurs from the same areas of the vehicle. RESULT Result Proceed to Location of noise has not changed A Location of noise has changed B Noise has stopped C HINT: If the problem area has changed, replace the active stabilizer control ECU on the side in which the problem is occurring. If the problem area has not changed, replace the active stabilizer control actuator on the side in which the problem is occurring. B --> REPLACE ACTIVE STABILIZER CONTROL ECU A --> REPLACE ACTIVE STABILIZER CONTROL ACTUATOR C: Go to next step
5. CHECK OPERATION OF ACTIVE STABILIZER CONTROL ECU Restore the exchanged ECU to its original location. Perform the driving test to determine if the ECU is securely installed. Check if noise occurs. OK Noise does not occur. OK --> CHECK INTERMITTENT PROBLEMS NG --> REPLACE ACTIVE STABILIZER CONTROL ECU (ON SIDE WHERE NOISE OCCURS)

Scheme 101

1. CHECK DTC Check for DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . OK DTC is not output. NG --> See step 6 OK: Go to next step
2. TEST MODE INSPECTION (MULTI INFORMATION DISPLAY) Enter test mode. Refer to «TEST MODE PROCEDURE»(ref-386966-S21850258732011022400000) . When switching to test mode, check if the test mode is displayed on the multi-information display of the combination meter. RESULT Result Proceed to Test mode is not displayed A Test mode is displayed B B --> See step 4 A: Go to next step
3. CHECK WIRE HARNESS (CAN COMMUNICATION LINE) Disconnect the A58 front active stabilizer control ECU connector. Measure the resistance of the wire harness side connector. Standard resistance Tester Connection Specified Condition A58-1 (LCN+) - A58-8 (LCN-) 54 to 69 ohms A58-2 (CANH) - A58-3 (CANL) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 8
4. TEST MODE INSPECTION Perform the test mode inspection. Refer to «TEST MODE PROCEDURE»(ref-386966-S21850258732011022400000) . NEXT: Go to next step
5. CHECK TEST MODE DTC Check test mode DTC. Refer to «DTC CHECK / CLEAR»(ref-386966-S21674868462011022400000) . OK DTC is not output. NG --> See step 7 OK --> END (NORMAL)
6. GO TO FLOWCHART OF EACH DTC. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-386966-S00971245922011022400000)
7. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-386966-S00971245922011022400000)
8. GO TO METER / GAUGE SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-387092-S02397406432011022400000)