GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2005 🢒 Vibe - AWD 🢒 Restraints 🢒 SIR 🢒 DTC B1795

Circuit Description

This DTC identifies a malfunction within the passenger presence system (PPS) module. If the sensing and diagnostic module (SDM) detects a malfunction within the PPS module, a DTC will be set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1795 Passenger Presence System Sensor Circuit

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

The SDM detects a PPS module malfunction.

Action Taken When the DTC Sets

The SDM commands the AIR BAG indicator ON.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.

Diagnostic Aids

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.

The following are possible causes of the malfunction:

    • An open or high resistance in the PPS module ignition positive voltage circuit
    • A short to ground in the PPS module ignition positive voltage circuit
    • An open or high resistance in the PPS module ground circuit
    • An internal PPS module malfunction

If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

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

  1. This step tests the PPS module ignition positive voltage circuit.

    2.

  2. This step tests the PPS module ground circuit.

Step

Action

Values

Yes

No

Schematic Reference: SIR Schematics

Connector End View Reference: SIR Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Is DTC B1795 set as a current DTC?

--

Go to Step 3

Go to Diagnostic Aids

3

Is DTC B1771 set as a current DTC?

--

Go to DTC B1771

Go to Step 4

4
  1. Turn OFF the ignition.
  2. Disconnect the passenger presence system (PPS) module connector.
  3. Inspect the PPS module connector for the following conditions:
    4. • Corrosion
    • Damaged terminals
    • Poor contact/terminal tension

Did you find and correct the condition?

--

Go to Step 10

Go to Step 5

5

  1. Disconnect the PPS module connector.
  2. Turn the ignition ON, with engine OFF.
  3. Measure the voltage of the ignition positive voltage circuit. Refer to Circuit Testing .

Is the voltage as specified?

10-14 V

Go to Step 6

Go to Step 7

6

  1. Disconnect the PPS module connector.
  2. Measure the resistance of the PPS module ground circuit. Refer to Circuit Testing .

Is the resistance as specified?

Below 1 ohms

Go to Step 9

Go to Step 8

7

Repair the short to ground, open, or high resistance in the PPS module ignition positive voltage circuit. Refer to Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 9

--

8

Repair the open or high resistance in the PPS module ground circuit. Refer to Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 10

--

9

Replace the PPS module. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .

Did you complete the replacement?

--

Go to Step 10

--

10
  1. Reconnect all SIR components.
  2. Verify that all components, connectors, and connector position assurances (CPAs) are properly mounted.
  3. Use the scan tool in order to Clear the DTCs.
  4. 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