Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0870 03

Control Module Voltage Reference Output Circuit Low Voltage

DTC C0870 07

Control Module Voltage Reference Output Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5V Reference	C0870 03	C0595 05, C0600 05, C0605 05, C0670 05, C0675 05	C0870 07	-
Low Reference	-	C0595 05, C0600 05, C0605 05, C0670 05, C0675 05	-	-

Circuit/System Description

The suspension control module supplies a 5 V reference voltage and a low reference to each body acceleration sensor and wheel acceleration sensor. The body acceleration sensors and wheel acceleration sensors supply a signal of 0.5-4.5 V to the suspension control module.

Conditions for Running the DTC

System voltage is between 9-16 V.

Conditions for Setting the DTC

C0870 03

The suspension control module detected a short to ground on the 5 V reference circuit for 1.5 s.

C0870 07

The suspension control module detected a short to voltage on the 5 V reference circuit for 1.5 s.

Action Taken When the DTC Sets

•	The electronic suspension control is disabled for the duration of the ignition cycle.

•	The driver information center displays the SERVICE SUSPENSION SYSTEM message.

Conditions for Clearing the DTC

•	A present DTC will clear on the next consecutive malfunction-free ignition cycle.

•	A history DTC will clear after 41 consecutive malfunction-free ignition cycles.

Reference Information

Schematic Reference

Electronic Suspension Control Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electronic Suspension Control Description and Operation

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Suspension Position Sensor 5 V Reference parameter. The reading should be 5 V.

Circuit/System Testing

1.	Ignition OFF, disconnect the harness connectors at all 5 vertical body and wheel acceleration sensors.

2.	Ignition ON, test for 4.8-5.2 V between one of the 5 V reference circuits terminal 1 and ground.

3.	If less than the specified range, test the 5 V reference circuit for a short to ground. If the circuit tests normal, replace the K19 Suspension Control Module.

4.	If greater than the specified value, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K19 Suspension Control Module.

5.	Test for 4.8-5.2 V between all 5 vertical body and wheel acceleration sensor signal circuit terminals 2 and ground.

6.	If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K19 Suspension Control Module.

7.	If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K19 Suspension Control Module.

8.	Ignition OFF, connect each component associated with the 5 V reference circuit one at a time while observing the scan tool Suspension Position Sensor 5 V Reference parameter. Verify the reading is 5 V.

9.	If not the specified value when a component is connected, replace the component.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Electronic Suspension Front Vertical Accelerometer Replacement - Upper

•	Electronic Suspension Front Vertical Accelerometer Replacement - Lower

•	Electronic Suspension Rear Position Sensor Replacement

•	Control Module References for suspension control module replacement, setup, and programming