Circuit Description
The instrument panel module (IPM) has designated circuits for monitoring vehicle system voltage. The IPM monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range. The IPM monitors the system voltage over an extended length of time. If the IPM detects the system voltage is outside an expected range for the calibrated length of time, or the IPM battery sense circuits differ by 3 volts DTC B1517 will set. Other modules also monitor system voltage 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
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, engine speed greater than 1,100 RPM for 15 seconds. |
| • | The battery voltage is greater 16 volts, engine speed greater than 1,100 RPM for 15 seconds. |
| • | The battery voltage differs by 3 volts on the IPM battery sense circuits for 15 seconds. |
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 a scan tool. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
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.
-
This step tests the ground sense circuit of the IPM.
-
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 or Power Distribution Schematics Connector End View Reference: Master Electrical Component List | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Do any of the voltages differ more than the specified value? | 3 V | Go to Step 5 | Go to Step 3 |
Do the voltages differ more than the specified value? | 3 V | Go to Step 9 | Go to Step 4 | |
Measure the voltage from the battery positive voltage circuits of the IPM to a good ground. Do the voltages differ more than the specified value? | 3 V | Go to Step 8 | Go to Step 7 | |
Does the voltage measure within the specified range? | 10.5-15.5 V | 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 within the specified range? | 10.5-15.5 V | 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 module IPM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 11 | -- |
11 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
