PINPOINT TEST I : The BCM Does Not Respond To The Scan Tool
NOTE:
Failure to disconnect the battery when instructed will result in false resistance readings. REFER to Battery, Mounting and Cables
- I1 CHECK BCM VOLTAGE SUPPLY
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C2280G-1 Ground
Is the voltage greater than 11 volts on both sides of the fuse?
Yes GO to I2. No VERIFY the high current BJB fuse B (100A) is OK. If OK, GO to I12. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short. - I2 CHECK THE BCM GROUND CIRCUIT FOR AN OPEN
- Disconnect: BCM C2280D.
- Disconnect: Negative Battery Cable.
- Measure:
Positive Lead Measurement / Action Negative Lead C2280D-25 Ground
Is the resistance less than 3 ohms?
Yes GO to I3. No REPAIR the circuit. - I3 CHECK THE HS-CAN TERMINATION RESISTANCE
- Ignition OFF.
- Disconnect the scan tool cable from the DLC.
Is the resistance between 54 and 66 ohms?
Yes GO to I4. No GO to I9. - I4 CHECK THE MS-CAN TERMINATION RESISTANCE
Is the resistance between 54 and 66 ohms?
Yes CONNECT the negative battery cable. GO to I12. No GO to I5. - I5 CHECK THE MS-CAN TERMINATION RESISTANCE WITH THE HVAC MODULE DISCONNECTED
- Disconnect: HVAC module C228A.
Is the resistance between 108 and 132 ohms?
Yes GO to Pinpoint Test J . No GO to I6. - I6 CHECK THE MS-CAN CIRCUITS BETWEEN THE BCM AND THE DLC FOR AN OPEN
- Disconnect: BCM C2280B.
Are the resistances less than 3 ohms?
Yes GO to I7. No REPAIR the circuit in question in question. - I7 CHECK THE MS-CAN CIRCUITS FOR A SHORT TO POWER
- Connect: BCM C2280B.
- Connect: Negative Battery Cable.
- Ignition ON.
Is the voltage greater than 3 volts on either circuit?
Yes REPAIR the circuit in question in question. No GO to I8. - I8 CHECK THE MS-CAN CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Negative Battery Cable.
Are the resistances greater than 10, 000 ohms?
Yes GO to I9. No REPAIR the circuit in question in question. - I9 CHECK THE HS-CAN CIRCUITS BETWEEN THE BCM AND THE DLC FOR AN OPEN
- Disconnect: BCM C2280F.
Are the resistances less than 3 ohms?
Yes GO to I10. No REPAIR the circuit in question. - I10 CHECK THE HS-CAN CIRCUITS FOR A SHORT TO POWER
- Connect: BCM C2280F.
- Ignition ON.
Is the voltage greater than 3 volts on either circuit?
Yes REPAIR the circuit in question. No GO to I11. - I11 CHECK THE HS-CAN CIRCUITS FOR A SHORT TO GROUND
Are the resistances greater than 10, 000 ohms?
Yes CONNECT the negative battery cable. GO to I12. No REPAIR the circuit in question. - I12 CHECK FOR CORRECT BCM OPERATION
- Ignition OFF.
- Disconnect and inspect the BCM connector and related in-line connectors.
- Repair:
- corrosion (replace connector or terminals - clean module pins)
- damaged or bent pins - replace terminals/pins
- pushed-out pins - replace pins as necessary
- Reconnect the BCM connector and related in-line connectors. Make sure they seat and latch correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no TSBs address this concern, INSTALL a new BCM. REFER to REFER to Multifunction Electronic Modules No The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
NOTE:
Measurements are taken with the fuse installed and probes placed at the terminals on the back of the fuse blade.
NOTE:
Measurements are taken with the fuse installed and the probes placed at the terminals on the back side of the fuse blade.