B -- GO TO VEHICLE STABILITY CONTROL SYSTEM See: Diagnostic Trouble Code Descriptions/Vehicle Stability Control
System
A -- REPLACE SUSPENSION CONTROL ECU
From 08/2009
SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1787: Forward/Rearward/Sideways G Sensor Communication Error
C1787 - Forward/Rearward/Sideways G Sensor Communication Error
DESCRIPTION
The suspension control ECU receives longitudinal G signals and lateral G signals via the CAN communication system from the yaw rate and
acceleration sensor.
INSPECTION PROCEDURE
NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
- If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first See:
C1782.
- Before replacing the suspension control ECU, perform all of the following again: 1) symptom simulation See: Accessories
and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Diagnostic Aids/How To Troubleshoot ECU Controlled
Systems/How To Proceed With Troubleshooting; 2) DTC inspection See: Steering and Suspension/Suspension/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes; and 3) Techstream inspection (Data List or Active Test) See:
Steering and Suspension/Suspension/Testing and Inspection/Scan Tool Testing and Procedures. If no malfunctions are found
in other areas, replace the suspension control ECU.
- If the suspension control ECU is replaced, the vehicle height offset calibration and registration of vehicle identification
information must be performed See: Steering and Suspension/Suspension/Suspension Control ( Automatic - Electronic
)/Testing and Inspection/Calibration and See: Steering and Suspension/Suspension/Suspension Control ( Automatic -
Electronic )/Testing and Inspection/Registration)
PROCEDURE
1. CHECK CAN COMMUNICATION SYSTEM
(a) Check the CAN communication system for any malfunctions See: Powertrain Management/Computers and Control
Systems/Information Bus/Testing and Inspection/Initial Inspection and Diagnostic Overview/CAN Communication System/Diagnosis
System.
Result:
B -- GO TO CAN COMMUNICATION SYSTEM See: Powertrain Management/Computers and Control Systems/Information
Bus/Testing and Inspection/Initial Inspection and Diagnostic Overview/CAN Communication System/How to Proceed With
Troubleshooting
A -- Continue to next step.
2. CHECK DTC (VEHICLE STABILITY CONTROL SYSTEM)
(a) Check if the VSC system outputs any DTC relevant to speed sensors See: Brakes and Traction Control/Antilock Brakes / Traction
Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes.
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