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

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
12 V Reference | 1 | 1 | -- | --
Cradle Signal 1 | -- | -- | -- | --
Cradle Signal 2 | -- | -- | -- | --
Low Reference | -- | 1 | 1 | --
1. Charging Inoperative

### Circuit/System Description

The mobile telephone control module uses the cradle to charge the cellular telephone.

### Reference Information

#### Schematic Reference

LINK

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Cellular Telephone 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, connect the cellular phone to the cradle observe the scan tool 'Phone in Cradle parameter. The reading should be Yes.

⇒ | If the reading is No, refer to Connecting Malfunction.

⇒ | If the reading is Yes, refer to Charging Inoperative.

### Circuit/System Testing

Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

#### Connecting Malfunction

1. Ignition OFF, disconnect the X2 connector at the K82 Mobile Telephone Control Module and the X1 connector at the X91 Phone Connector.
2. Ignition ON, test for less than 0.3 V between the signal circuit terminal 13 (X2) at the K82 Mobile Telephone Control Module and ground.

⇒ | If greater than the specified range, test the signal circuit terminal 13 (X2) at the K82 Mobile Telephone Control Module for a short to voltage.

3. Ignition ON, test for less than 0.3 V between the signal circuit terminal 15 (X2) at the K82 Mobile Telephone Control Module and ground.

⇒ | If greater than the specified range, test the signal circuit terminal 15 (X2) at the K82 Mobile Telephone Control Module for a short to voltage.

4. Ignition OFF, test for infinite resistance between the signal circuit terminal 13 (X2) at the K82 Mobile Telephone Control Module and ground.

⇒ | If less than the specified range, test the signal circuit terminal 13 (X2) at the K82 Mobile Telephone Control Module for a short to ground.

5. Ignition OFF, test for infinite resistance between the signal circuit terminal 15 (X2) at the K82 Mobile Telephone Control Module and ground.

⇒ | If less than the specified range, test the signal circuit terminal 15 (X2) at the K82 Mobile Telephone Control Module for a short to ground.

6. Ignition OFF, test for less than 5 Ω between the signal circuit terminal 13 (X2) at the K82 Mobile Telephone Control Module and the signal circuit terminal 2 (X1) at the X91 Phone Connector.

⇒ | If less than the specified range, test the signal circuit terminal 13 (X2) at the K82 Mobile Telephone Control Module for an open/high resistance.

7. Ignition OFF, test for less than 5 Ω between the signal circuit terminal 15 (X2) at the K82 Mobile Telephone Control Module and the signal circuit terminal 4 (X1) at the X91 Phone Connector.

⇒ | If less than the specified range, test the signal circuit terminal 15 (X2) at the K82 Mobile Telephone Control Module for an open/high resistance.

8. If all circuits test normal, replace the X91 Phone Connector and verify that the customer concern is not still present.

⇒ | If the customer concern is still present, replace the K82 Mobile Telephone Control Module.

#### Charging Inoperative

1. Ignition OFF, disconnect the X1 connector at the X91 Phone Connector.
2. Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 1 (X1) and ground.

⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K82 Mobile Telephone Control Module.

3. Ignition ON, test for greater than 11 V between the 12 V reference circuit terminal 3 (X1) and ground.

⇒ | If less than the specified range, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K82 Mobile Telephone Control Module.

4. If all circuits test normal, replace the X91 Phone Connector

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Mobile Telephone Control Module Replacement

• | Control Module References for mobile telephone control module replacement, setup, and programming