E 450 V8-5.4L (2009)
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint
test. See: Initial Inspection and Diagnostic Overview/Communications Network/Inspection and Verification
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
-------------------------------------------------
D1 CHECK THE RCM CONNECTION
-
Ignition OFF.
-
Depower the SRS. Refer to Air Bag Systems.
-
Disconnect: RCM C310a.
-
Disconnect: RCM C310b.
-
Inspect the RCM connector for damaged, pushed out or corroded pins.
-
Are RCM C310a-13 and RCM C310b-9 and C310b-10 OK?
Yes
GO to D2.
No
REPAIR the RCM connector pins as necessary. REPOWER the SRS. REFER to Air Bag Systems. CLEAR the DTCs. REPEAT the network test with
the scan tool.
-------------------------------------------------
D2 CHECK THE RCM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
-
Repower the SRS. Refer to Air Bag Systems.
-
Ignition ON.
-
Measure the voltage between the RCM C310a-13, circuit CBP32 (GN/VT), harness side and ground.
-
Is the voltage greater than 10 volts?
Yes
GO to D3.
No
VERIFY the Smart Junction Box (SJB) fuse 32 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the
possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
-------------------------------------------------
D3 CHECK THE RCM CASE GROUND
-
Ignition OFF.
-
Disconnect: Negative Battery Cable.
-
Measure the resistance between the RCM case and a good chassis ground.
-
Is the resistance less than 5 ohms?
Yes
GO to D4.
