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 +Battery Voltage Sense (High Precision) - 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 in Vehicle DTC Information.
DTC Symptom | DTC Symptom Descriptor |
|---|---|
03 | Voltage Below Threshold |
07 | Voltage Above Theshold |
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 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.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Starting and Charging Schematics or Power Distribution Schematics in Wiring Systems Connector End View Reference: Master Electrical Component List in Wiring Systems | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Do the voltages differ more than the specified value? | 1 V | Go to Step 6 | Go to Step 3 | |
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? | 1 V | Go to Step 5 | Go to Step 4 | |
4 | Test the battery positive voltage circuits of IPM for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 6 |
5 | Test the ground sense circuit for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 6 |
6 | Inspect for poor connections at the harness connector of the IPM . Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 7 |
7 | Replace the module IPM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 8 | -- |
8 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
