2004 CDL Switches Wiring to pin 7 - C0681
Rock Crawling
Joined: Apr 2018
Posts: 255
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My 2003 was retrofitted with a 2004 transfer case and CDL kit. However, I did not have to change the SLABS ECU. Traction control worked when CDL is engaged.
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More good info on this link: https://discotd5.com/ecu-upgrades/up...e-facelift-d2s
While retro-fitting the CDL lever to 1999-2002MY Discovery 2's is a popular upgrade, it's often followed up with a modification that prevents the SLABS ECU from detecting the CDL has been locked. On the 1999-2002MY D2's the locked CDL triggers a mode of operation that disables Traction Control and reduces the effectiveness of ABS, EBD and HDC.
By cutting the wire from the CDL switch the SLABS ECU operates as if the CDL is unlocked regardless of its actual state.
The 2003 and 2004MY D2's offered the CDL lever as a factory option, and this was fitted to all vehicles imported into Australia. As part of this change Land Rover revised the
programming of the SLABS ECU to work correctly with the locked CDL. While it is difficult to quantify the revised ECU is claimed to have improved ABS and ETC programming, and
I noticed what appeared to be slight improvement in pedal feel after upgrading the ECU in my vehicle.
The main benefit of upgrading to the later ECU is that with the CDL locked the SLABS programming is altered to work in conjunction with the changed power transmission.
There were two variants of the update ECU produced:
SRD000150 which was fitted to 2003MY vehicles
SRD500070 which was originally fitted to 2004MY vehicles
Vehicles built prior to 2003MY should be fitted with a SRD000070, as the ECU revisions prior to this were subject to a recall which mandated installation of the SRD000070 ECU.
The recall - A/B/D 263 issued in 2002 - indicates that metallic debris within the hub can attach to the wheel speed sensor causing the sensor to misread speed, which results in
the SLABS unit incorrectly reducing braking pressure.
The VINs covered by the recall were fitted with SRD100461 or SRD100462 from the factory. If these are still fitted the vehicle has missed the recall.
--------------------------------------------------------------------------------------------------------
More good info on this link: https://discotd5.com/ecu-upgrades/up...e-facelift-d2s
While retro-fitting the CDL lever to 1999-2002MY Discovery 2's is a popular upgrade, it's often followed up with a modification that prevents the SLABS ECU from detecting the CDL has been locked. On the 1999-2002MY D2's the locked CDL triggers a mode of operation that disables Traction Control and reduces the effectiveness of ABS, EBD and HDC.
By cutting the wire from the CDL switch the SLABS ECU operates as if the CDL is unlocked regardless of its actual state.
The 2003 and 2004MY D2's offered the CDL lever as a factory option, and this was fitted to all vehicles imported into Australia. As part of this change Land Rover revised the
programming of the SLABS ECU to work correctly with the locked CDL. While it is difficult to quantify the revised ECU is claimed to have improved ABS and ETC programming, and
I noticed what appeared to be slight improvement in pedal feel after upgrading the ECU in my vehicle.
The main benefit of upgrading to the later ECU is that with the CDL locked the SLABS programming is altered to work in conjunction with the changed power transmission.
There were two variants of the update ECU produced:
SRD000150 which was fitted to 2003MY vehicles
SRD500070 which was originally fitted to 2004MY vehicles
Vehicles built prior to 2003MY should be fitted with a SRD000070, as the ECU revisions prior to this were subject to a recall which mandated installation of the SRD000070 ECU.
The recall - A/B/D 263 issued in 2002 - indicates that metallic debris within the hub can attach to the wheel speed sensor causing the sensor to misread speed, which results in
the SLABS unit incorrectly reducing braking pressure.
The VINs covered by the recall were fitted with SRD100461 or SRD100462 from the factory. If these are still fitted the vehicle has missed the recall.
I've never seen a production date on a SRD500070 (date code on label on upper right corner) earlier than 2006 which leads me to believe that these modules were part of an update or warranty concern installed long after the vehicle was originally built.
I basically put a meter on it. Positive to the green wire and grounded the other lead and got no power to it
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sreejeshonchiyam
Discovery II
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Feb 11, 2020 12:04 PM