Keyless Start System - Engine No Start/No Crank
01 12 30October 3, 2012
2012705 Supersedes T.B. V010615 dated September 19, 2006 to update warranty information.
Vehicle Information
Condition
Engine, Cranks Intermittently or No Crank
Customer may state that engine cranks intermittently or will not crank.
May be more evident when HOT.
Technical Background
May be caused internally when the Steering Column Electronic Systems Control Module -J527- fails, this causes Terminal 50 to not energize high, which results in a no crank condition.
Steering Column Electronic Systems Control Module -J527- performs two operations when starting the vehicle.
When ignition is turned to crank position:
^ A message is sent via CAN bus to Vehicle Electrical System Control Module -J519-.
^ The Terminal 50 circuit between Vehicle Electrical System Control Module -J519- and Steering Column Electronic Systems Control Module -J527- is energized to high.
Tip:
Fault code for "00885 Ignition/Starter Switch -D- (terminal 50) 008 implausible signal 001 sporadic" may be stored in Vehicle Electrical System Control Module -J519-.
Production Solution
No production change required.
Service
^ Verify the output of the Steering Column Electronic Systems Control Module -J527- using VAS 5051/5052.
^ Enter address word 16 - Steering Wheel Electronics.
^ Read Measuring Value Block 3.
In field one, there will be a bit pattern which is relevant to ignition switch status.
Similar screen appears:
^ Turn ignition switch to the crank position and
observe that the last bit cycles from "0" to "1", as
shown.
Tip:
Example of switch in crank position: 01011
If the bit does not cycle, then verify the integrity of
the ignition switch (further diagnostics are needed.
DO NOT continue with this Technical Bulletin).
^ Exit address word 16 - Steering Wheel Electronics.
^ Enter address word 09 - Electronic Central Electrics.
^ Read Measuring Value Block 7.
^ Turn ignition switch to the crank position again and hold.
The first field is a status indication of the Terminal 50 input on pin G1 on the Vehicle Electrical System Control
Module -J519-.
Similar screen appears:
^ If this does not cycle from "OFF" to "ON" , as
shown, when in the crank position then the
Vehicle Electrical System Control Module -J519-
is not receiving a Terminal 50 input from the
Steering Column Electronic Systems Control
Module -J527-.
Verify Terminal 50 circuit and connector terminals between Vehicle Electrical System Control Module -J519- and Steering Column Electronic Systems Control Module -J527-.
Circuit path: Pin 1 on the 12 pin G connector of Vehicle Electrical System Control Module -J519- to pin 18 on the 20 pin connector of the Steering Column Electronic Systems Control Module -J527-.
Steering Column Electronic Systems Control Module
-J527- located under steering column, -arrow-.
Connector G located on top of Vehicle Electrical System Control Module -J519-, -arrow-.
If Terminal 50 circuit is valid:
^ Replace Steering Column Electronic Systems Control Module -J527-. See Repair Manual Group 94 - Lights, Switches - exterior, Steering Column Switches.
Tip:
It is helpful to copy the coding of the Steering Column Electronic Systems Control Module -J527- prior to exchanging the part.
If Terminal 50 circuit or connector terminals are damaged:
^ Repair as necessary.
Warranty
Required Parts and Tools