For 1990-2009 cars

### 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.

### Diagnostic Fault Information

#### Electrical DTCs

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Tour Mode Switch Signal Circuit | B0982 02 | 1 | 1 | --
1. Tour mode switch/indicator always on or inoperative

### Typical Scan Tool Data

#### Suspension System Mode

Circuit | Short to Ground | Open/High Resistance | Short to Voltage
--- | --- | --- | ---
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: Comfort/Sport Mode/Normal/Hard
Tour Mode Switch Signal Circuit | Undefined | -- | Undefined

### Circuit/System Description

The sport mode switch, tour mode switch, sport mode light emitting diode (LED) and tour mode LED are combined into one switch module. The body control module (BCM) monitors the sport mode switch and the tour mode switch. When either switch is pressed, the BCM will request the suspension control module, transmission control module (TCM) and engine control module (ECM) via serial data to control the vehicle ride characteristic according to the selected mode. The BCM will command the sport mode or tour mode LED ON to notify the driver of the selected mode.

### Reference Information

#### Schematic Reference

Automatic Transmission Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Description and Operation

Electronic Suspension Control Description and Operation

#### Scan Tool Reference

Control Module References for scan tool information.

### Circuit/System Verification

1. Verify no communication related DTC is set.

⇒ | If any communication DTC is set, diagnose those first.

2. Ignition ON, observe the scan tool Suspension System Mode parameter while pressing and releasing one after the other S48C Multifunction Switch - Sport Mode and S48D Multifunction Switch - Tour Mode. Verify the reading changes between Comfort/Sport Mode/Normal/Hard.

⇒ | If the parameter does not change between the specified values, go to circuit/system testing.

3. Observe the sport mode LED and the tour mode LED while pressing and releasing one after the other S48C Multifunction Switch - Sport Mode and S48D Multifunction Switch - Tour Mode. The sport mode LED and the tour mode LED should turn ON and OFF.

⇒ | If the LED does not change between the specified values, go to circuit/system testing.

### Circuit/System Testing

#### Static Test

Note: Circuit/system verification must be performed before circuit/system testing.

• | Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module (BCM).

• | Ignition ON, verify the sport mode LED is OFF.

⇒ | If the sport mode LED does not turn OFF, test the control circuit for a short to voltage.

#### Dynamic Test

Note: Circuit/system verification must be performed before circuit/system testing.

1. Ignition OFF, disconnect the S48D Multifunction Switch - Tour Mode harness connector.
2. Ignition ON, observe the scan tool Suspension System Mode parameter while installing a 3 A fused jumper wire between the S48D Multifunction Switch - Tour Mode terminal 4 and ground. Verify the reading changes between Sport Mode/Normal/Hard.

⇒ | If the parameter does not change between the specified values, test the wiring harness for short to voltage or an open/high resistance. If the circuit test normal, replace the K9 Body Control Module (BCM).

3. Ignition OFF, connect a test lamp to S48D Multifunction Switch - Tour Mode terminal 8 and ground.
4. Ignition ON, the test lamp has to illuminate while installing a 3 A fused jumper wire between the S48D Multifunction Switch - Sport Mode terminal 4 and ground.

⇒ | If the test lamp does not illuminate, test the sport mode LED signal circuit for a short to ground or an open/high resistance.

5. Test the S48D Multifunction Switch - Tour Mode ground circuit for an open/high resistance.
6. If the circuit test normal, replace the S48D Multifunction Switch - Tour Mode.

### Repair Instructions

• | Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Electronic Suspension Control Module Replacement.

• | Instrument Panel Multifunction Switch Replacement for multifunction switch replacement.

• | Body Control Module Replacement for BCM replacement, setup and programming.