For 1990-2009 cars

### Circuit Description

The instrument panel module (IPM) has designated circuits for monitoring vehicle system voltage. Other modules also monitor system voltage. The IPM has 3 power inputs and a main ground circuit. The 3 power circuits are plus battery voltage sense (high precision), minus battery voltage sense (high precision sense return) and + E BATT 1 (low precision sense, main IPM battery feed). There is also IPM (Low Precision Sense, Main IPM ground). When the IPM sets B1517, the system voltage message is sent to the other modules and will default to 12.9 volts.

### DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1517 Battery Voltage (Signal or 1) Voltage

This vehicle has DTCs which include DTC symptoms. For more information, refer to DTC Symptom Description.

DTC Symptom | DTC Symptom Descriptor
--- | ---
03 | Voltage Below Threshold
07 | Voltage Above Threshold
52 | Compare Failure

### Conditions for Running the DTC

This DTC shall run only if the IPM has power, ground, and the ignition is not in START mode. This DTC shall execute regardless of the battery voltage, except when the DTC B1440 is set current.

### Conditions for Setting the DTC

• | The battery voltage falls below 11 volts.

• | The battery voltage is greater 16 volts.

### Action Taken When the DTC Sets

#### B1517 03

The driver information center (DIC) displays the battery voltage low message.

#### B1517 07

The DIC displays the battery voltage high message.

#### B1517 52

The DIC displays the SERVICE VEHICLE SOON message.

### Conditions for Clearing the DTC

• | The DTC will clear current status when the fault is no longer present.

• | A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.

• | Use the On-Board clearing DTCs feature.

• | Use a scan tool.

### Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. This step tests for the proper voltage at battery positive voltage sense circuits of the IPM. If voltages are not within the proper operating range, the voltage sense circuits needs to be tested.

2. This step tests the ground sense circuit of the IPM.

3. This step tests for the proper voltage of the 3 circuits to the IPM. If voltage is not within the proper operating range, the battery positive voltage and ground circuits of the IPM need to be tested.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
Schematic Reference: Starting and Charging Schematics Connector End View Reference: Component Connector End Views
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the Battery Voltage parameters in the instrument panel module (IPM) data list.

Do any of the voltages differ more than the specified value?

1V

Go to Step 5

Go to Step 3

3 |

1. Turn OFF the ignition.
2. Disconnect the IPM.
3. Turn ON the ignition, with the engine OFF.
4. Measure the voltage between the battery positive voltage circuits of the IPM and the ground sense circuit at terminal of the IPM.

Is the voltage higher than the specified value?

1V

Go to Step 9

Go to Step 4

4 | Measure the voltage between the battery positive voltage circuits of IPM and a good ground. Is the voltage higher than the specified value? | 3V | Go to Step 8 | Go to Step 7
5 |

1. Turn OFF the ignition.
2. Measure the voltage between the battery positive voltage circuits of the IPM and the ground circuit of the IPM.

Does the voltage measure greater than the specified value?

9.4V

Go to Step 9

Go to Step 6

6 | Measure the voltage between the battery positive voltage circuit of IPM and a good ground. Does the voltage measure greater than the specified value? | 9.4V | Go to Step 8 | Go to Step 7
7 | Test the battery positive voltage circuits of IPM for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9
8 | Test the ground sense circuit for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9
9 | Inspect for poor connections at the harness connector of the IPM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10
10 | Replace the IPM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 11 | --
11 |

1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK