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o 4 Cylinders F 2.2L SFI DOHC (found in 95% of 2008 Chevrolet Cobalt)
Trouble Code: B1370 01 (2.2L L4 VIN F Auto)Device Ignition 1 (ON and START) Circuit Short To Battery
/ Print this code dataTrouble Code Conditions:
Voltage is between 9-16 volts.
Possible Causes:
§ The BCM detects a short to ground in the circuit.
§ The BCM detects a short to battery or an open in the circuit when the switch is in the OFF position.
Trouble Code: B1370 04 (2.2L L4 VIN F Auto)Device Ignition 1 (ON and START) Circuit Open
/ Print this code dataTrouble Code Conditions:
Voltage is between 9-16 volts.
Possible Causes:
§ The BCM detects a short to ground in the circuit.
§ The BCM detects a short to battery or an open in the circuit when the switch is in the OFF position.
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PATH:DiagnosticsDiagnostic RoutinesBodySupplemental Inflatable RestraintsDTC B0081 / PrintDTC B0081
NOTEApplicable vehicles:
§ Cobalt, G5 (VIN A)
§ HHR (VIN A)
DTC B0081
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.
DTC Descriptors
DTC B0081 3A: Passenger Presence System Incorrect Component Installed
DTC B0081 39: Passenger Presence System Internal Electronic Failure
DTC B0081 71: Passenger Presence System Invalid Serial Data Received
Circuit/System Description
When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. When the SDM has completed the power-up mode, the SDM will establish communication with the passenger presence system (PPS). The PPS will respond by requesting both of the PASSENGER AIR BAG ON/OFF indicators to illuminate for 5 seconds. The SDM will then transmit a request message to the PPS to receive the PPS verification ID. The PPS will transmit the verification ID to the SDM, and the SDM will compare the ID received to data stored in memory. If the data stored in memory does not match the information transmitted by the PPS or the SDM has detects that the PPS has set a current DTC the SDM will then disable the instrument panel (I/P) module deployment loop, set DTC B0081 and illuminate the AIR BAG warning indicator.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
Any of the following conditions must exist for 5 seconds:
B0081 3A
§ The SDM has received an ID message from the PPS which does not match the ID stored in the SDM memory.
§ The SDM has reset the PPS twice without detecting the correct ID message.
B0081 39
§ The SDM has received a NOK message from the PPS.
§ The SDM has not received a message.
B0081 71
The SDM has received invalid serial data from the PPS.
Action Taken When the DTC Sets
§ The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG warning indicator.
§ The I/P module deployment loop will be disabled.
Conditions for Clearing the DTC
§ The condition for setting the DTC no longer exists.
§ A history DTC will clear once 100 malfunction-free ignition cycles have occurred.
Diagnostic Aids
If either the SDM or PPS were replaced verify that the correct part numbers were used for the vehicle application.
Reference Information
Schematic Reference
SIR Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
SIR System 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 Testing
Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
- PPS module
- SDM module
- PPS wiring harness connector
- SDM wiring harness connector
- Ignition ON, verify the PPS illuminates the PPS ON/OFF indicators.
o If the Passenger Air Bag ON/OFF status indicator does not illuminate, refer to Passenger Presence System Indicator Circuit Malfunction.
§ Ignition ON, with the scan tool. Retrieve the DTCs, refer to Passenger Presence System Flash Code Procedures. Verify no PPS DTCs are set.
o If the PPS has any current or history DTCs stored, refer to the Diagnostic Trouble Code (DTC) List - Vehicle.
§ Verify that the correct PPS was installed into the vehicle.
o If the wrong PPS was installed then replace with the correct PPS.
§ Ignition OFF, disconnect the harness connector at PPS module.
§ Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal 5 and ground.
o If not within the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PPS module.
§ Ignition ON, engine ON, verify that a test lamp illuminates between the ignition 1 voltage circuit terminal 9 and ground.
o If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance.
§ Ignition OFF, disconnect the harness connector at the SDM.
§ Test for less than 1.0 ohm along the occupant sensor serial data circuit terminal 18 to terminal 60.
o If not within the specified range, test the signal circuit for an open/high resistance.
§ If all circuits test normal, test or replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
§ SIR/SRS Wiring Repairs
§ Control Module References for PPS and SDM replacement, setup, and programming
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Enterterms: (required)
PATH:DiagnosticsDiagnostic RoutinesBodySupplemental Inflatable RestraintsDTC B1370 / PrintDTC B1370
NOTEApplicable vehicles:
§ Cobalt, G5 (VIN A)
DTC B1370
Diagnostic Instructions
§ Perform the Diagnostic System Check - Vehicle prior to using the diagnostic procedure.
§ Review Strategy Based Diagnosis for an overview of the diagnostic approach.
§ Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC B1370 06: Device Ignition 1 (On and Start) Circuit Short to Battery
Diagnostic Fault Information
Circuit / Short to Ground / Open/High Resistance / Short to Voltage / Signal Performance /Ignition 1 Voltage / B1370 06 / B1370 06 / -- / --
Run/Crank Relay Coil Control / 1 / 1 / 1 / --
1. A fault in this circuit will cause multiple symptoms including no start and may cause B1370 in the SDM.
Circuit/System Description
The inflatable restraint sensing and diagnostic module (SDM) monitors the ignition signal from the ignition switch. When the vehicle ignition switch is placed in the RUN or CRANK position, the switch supplies voltage to the SDM ignition input terminal. If an open or short to ground in this SDM ignition circuit is detected, then DTC B1370 will set.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
The SDM detects a short to ground or an open in the ignition voltage circuit for greater than 10 seconds when the ignition switch is in RUN or CRANK.
Action Taken When the DTC Sets
§ The SDM commands the AIR BAG indicator ON.
§ The SDM determines its power mode only from the serial data power mode messages and discards the ignition input for the remainder of the ignition cycle.
Conditions for Clearing the DTC
§ The condition for setting the DTC no longer exists.
§ A history DTC will clear once 100 malfunction-free ignition cycles have occurred.
Reference Information
Schematic Reference
SIR Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
SIR System Description and Operation
Electrical Information Reference
§ Circuit Testing
§ Testing for Intermittent Conditions and Poor Connections
§ Wiring Repairs
§ Connector Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
WARNINGImportant: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected.
§ SDM
§ SDM wiring harness
- Ignition OFF, remove the underhood AIRBAG fuse.
- Ignition ON, connect a test lamp between the B+ side to the fuse and ground. The test lamp should illuminate.
o If the test lamp does not illuminate, refer to DTC B1370-B1379, B1380-B1389, or B1440-B1443.
§ Ignition OFF, install the underhood AIRBAG fuse.
§ Disconnect the harness connector at the SDM.
§ Ignition ON, verify a test lamp illuminates between ignition circuit terminal 33 and ground.
o If the test lamp does not illuminate, test the ignition circuit for short to ground or an open/high resistance.
§ If all circuits test normal, replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
§ SIR/SRS Wiring Repairs
§ Control Module References for SDM replacement, setup, and programming
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Enterterms: (required)
PATH:DiagnosticsDiagnostic RoutinesWiring Systems and Power ManagementDTC B1370-B1379, B1380-B1389, or B1440-B1443 / PrintDTC B1370-B1379, B1380-B1389, or B1440-B1443
NOTEApplicable vehicles:
§ Cobalt, G5 (VIN A)
§ HHR (VIN A)
DTC B1370-B1379, B1380-B1389, or B1440-B1443
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.
DTC Descriptors
DTC B1370 01: Device Ignition 1 (ON and START) Circuit Short To Battery
DTC B1370 04: Device Ignition 1 (ON and START) Circuit Open
DTC B1380 01: Device Ignition ACCESSORY Circuit Short to Battery
DTC B1380 04: Device Ignition ACCESSORY Circuit Open
DTC B1441 01: Device Ignition OFF, RUN, and CRANK Circuit Short to Battery
DTC B1441 06: Device Ignition OFF, RUN, and CRANK Circuit Short to Ground or Open
Diagnostic Fault Information
Circuit / Short to Ground / Open/High Resistance / Short to Voltage /B+ - Terminal 2 / B1370 04, B1380 04 / B1370 01, B1380 01, / B1370 01, B1380 01
Ignition - Terminal 3 / B1370 04 / B1370 01 / B1370 01
Ignition - Terminal 4 / B1380 04 / B1380 01 / B1380 01
Ignition - Terminal 5 / B1441 06 / B1441 06 / B1441 01
Circuit/System Description
The vehicle power mode master (PMM) is the body control module (BCM). The ignition switch is a low current switch with multiple discrete ignition switch signals to the PMM for determination of the power mode. The PMM receives the ignition switch signals, and additionally a reference voltage signal from the BCM, through the ignition switch, and back to the BCM. There are redundancies within the PMM system that can allow operation of certain subsystems when there are faults in the ignition switch circuits. Other information such as serial data input from other modules and DTCs is also used to determine what power mode signals and information is transmitted by the PMM. The BCM logic uses all this information to identify the operator's desired power mode and activate specific discrete signals, and serial data messages for the operation of different subsystems as necessary. Other modules which have switched voltage inputs may operate in a default mode if the PMM serial data message does not match what the individual module can detect from its own connections.
The PMM will activate relays and other direct outputs of the PMM as needed according to the calculated power mode. Some relays controlled by the BCM are switched ignition voltage outputs that are pass through circuits within the BCM directly from the ignition switch. If these circuits short to ground, the B+ circuit fuse to the ignition switch will open.
Conditions for Running the DTC
Voltage is between 9-16 volts.
Conditions for Setting the DTC
§ The BCM detects a short to ground in the circuit.
§ The BCM detects a short to battery or an open in the circuit when the switch is in the OFF position.
Actions Taken When the DTC Sets
§ The BCM stores DTC to memory.
§ The BCM operates in a fail-safe power mode dependent on the last valid power mode detected and the state of the engine run flag data on the serial data communications circuits.
§ The other modules on the vehicle operate in a fail-safe power mode dependent on the last valid power mode transmitted by the BCM and the state of the engine run flag on the serial data communications circuits.
Conditions for Clearing the DTC
A current DTC clears when the malfunction is no longer present.
Diagnostic Aids
The power modes and controls are determined using BCM logic. Comparing the Body Control Module Power Mode data display parameters listed in Circuit/System Verification to the scan tool values of the vehicle will determine if there is a power mode fault.
Reference Information
Schematic Reference
§ Power Distribution Schematics
§ Power Moding Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Power Mode 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
With a scan tool, access BCM, Power Mode data display list and compare all parameters listed with the corresponding ignition key position. The PMM Power Mode Parameters table below illustrates the correct state of these input parameters in correspondence to the ignition switch position. The circuits which the individual parameters are related to are in parentheses.
§ If any parameters are incorrect in any key position, proceed to the Circuit/System Testing or Component Testing.
PMM Power Mode Parameters
Ignition Switch Position / Power Mode / Run Relay Command (Terminal 5) / Ignition Switch Accessory Signal (Terminal 4) / Run/Crank Relay Command (Terminal 3) /Operating Conditions: Drivers door open to disable RAP
Off Key Out / Off / Off / Inactive / Off
Off Key IN / Off / Off / Inactive / Off
Accessory / Accessory / Off / Active / Off
Run / Run / On / Active / On
Start / Crank Request / Off / Inactive / On
Circuit/System Testing