mikez71
Full Access Member
- Joined
- Mar 9, 2023
- Posts
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1.Remove radio trim. (plastic prybar)
2.Remove switchbank under hvac controls (7mm socket)
3.Remove HVAC module. (7mm socket)
4.Re-pin/de-pin ~11 wires shown below (pin removal tool or fine pick)
5.Wire illumination wire from J1-4 switchbank plug to J2-1 HVAC module. (1 or 2' of wire and some splice connectors)
J2 PLUG
----------
Manual climate control J2 connector is blue, the original automatic J2 plug is black.
It will not plug in directly, but looks like it would with a little modification to the lower alignment slots.
I de-pinned the wires, intending to re-pin them to the new connector. Reversible if problems.
The '07 plug I purchased has different pins than my '12 model.
I ran the new J2 pigtail wires through the original unplugged pin receptacles, then heatshrinked around each wire/receptacle.
(I have since acquired a 2013 J2 blue connector which will accept the original pins from my 2012)
To remove the pins, first remove the retainer (J1 plug, pin style shown, enclosure retainer on older connectors)
Insert a small pointy tool pointing to the bottom of the "T" slot, then pry upwards pointing to the top of the T to release the plastic tab holding pins in.
Pull wire out while holding tool. (ebay pin removal tool shown)
WIRING CHANGES
---------------------
auto CJ2 (BLACK J2) -> manual CJ3 (BLUE J2)
J2-1 (RD/WH) -> J2-4 (HVAC BATT)
J2-8 (BK/WH) -> J2-3 (GROUND ZONE 18)
J2-9 (OG) -> J2-2 (HVAC MAN RUN)
J2-15 (BK) -> J2-10 (BKLT GND)
J2-10 (WH) -> J2-8 (RR DEFOG RLY CONT PWR)
J2-4 (L-GN/BK) -> J2-9 (OUTSIDE AIR TEMP)
J2-16 (D-GN) -> J2-12 (TEMP SENS COM LO REF)
These are repinned in original connectors.
J1-18 (PK) -> J1-8 (PAS AR TMP SW SIG)
J1-19 (GY) -> J1-18 (RR MOD MOT SIG)
J4-6 (GY/BK) -> J4-5 (LOW REF)
This wire needs to be added for backlighting.
I spliced from switchbank wiring, also yellow wire.
+(BCM MBEC)BKLT -> J2-1 (HVAC LED BKLT) (YE)
----------------------------------------------------------------
Wiring from a stock 2013 manual CJ3, some wires are for the rear roof mount dial controls, which are unused on my truck.
)
------------------------------------------------------------------------------------------
Two wires show up in the '07 and '08 diagrams, but they are not in my '12 Tahoe.
On the '07 Avalanche plug I used (BLUE J2), there was a J2-6 wire, the J2-14 maybe on '08-?? models. By 2012 both wires are gone.
J2-6 (D-BU) -> J2-5 (AC LO PRS SEN SIG)
J2-14 (L-GN) -> J2-15 (COL LVL SW SIG)
-------------------------------------------------------------------------------------------
The wire list below is UNUSED in the manual controls, but the module does have a pin in that location,
UNPLUG this wire just in case.
--J3-3 (PU) RECIRC DR PSN SIG
-------------------------------------------------------------------------------------------
Unpopulated pins shown. J4 pin 1 and 9 are hidden, they are vacant.
Other than a faulty control unit resulting in multiple follow-up posts, there are no current issues.
Big "THANK YOU!" to everyone who helped out!
2.Remove switchbank under hvac controls (7mm socket)
3.Remove HVAC module. (7mm socket)
4.Re-pin/de-pin ~11 wires shown below (pin removal tool or fine pick)
5.Wire illumination wire from J1-4 switchbank plug to J2-1 HVAC module. (1 or 2' of wire and some splice connectors)
J2 PLUG
----------
Manual climate control J2 connector is blue, the original automatic J2 plug is black.
It will not plug in directly, but looks like it would with a little modification to the lower alignment slots.
I de-pinned the wires, intending to re-pin them to the new connector. Reversible if problems.
The '07 plug I purchased has different pins than my '12 model.
I ran the new J2 pigtail wires through the original unplugged pin receptacles, then heatshrinked around each wire/receptacle.
(I have since acquired a 2013 J2 blue connector which will accept the original pins from my 2012)
To remove the pins, first remove the retainer (J1 plug, pin style shown, enclosure retainer on older connectors)
Insert a small pointy tool pointing to the bottom of the "T" slot, then pry upwards pointing to the top of the T to release the plastic tab holding pins in.
Pull wire out while holding tool. (ebay pin removal tool shown)
WIRING CHANGES
---------------------
auto CJ2 (BLACK J2) -> manual CJ3 (BLUE J2)
J2-1 (RD/WH) -> J2-4 (HVAC BATT)
J2-8 (BK/WH) -> J2-3 (GROUND ZONE 18)
J2-9 (OG) -> J2-2 (HVAC MAN RUN)
J2-15 (BK) -> J2-10 (BKLT GND)
J2-10 (WH) -> J2-8 (RR DEFOG RLY CONT PWR)
J2-4 (L-GN/BK) -> J2-9 (OUTSIDE AIR TEMP)
J2-16 (D-GN) -> J2-12 (TEMP SENS COM LO REF)
These are repinned in original connectors.
J1-18 (PK) -> J1-8 (PAS AR TMP SW SIG)
J1-19 (GY) -> J1-18 (RR MOD MOT SIG)
J4-6 (GY/BK) -> J4-5 (LOW REF)
This wire needs to be added for backlighting.
I spliced from switchbank wiring, also yellow wire.
+(BCM MBEC)BKLT -> J2-1 (HVAC LED BKLT) (YE)
----------------------------------------------------------------
Wiring from a stock 2013 manual CJ3, some wires are for the rear roof mount dial controls, which are unused on my truck.
)------------------------------------------------------------------------------------------
Two wires show up in the '07 and '08 diagrams, but they are not in my '12 Tahoe.
On the '07 Avalanche plug I used (BLUE J2), there was a J2-6 wire, the J2-14 maybe on '08-?? models. By 2012 both wires are gone.
J2-6 (D-BU) -> J2-5 (AC LO PRS SEN SIG)
J2-14 (L-GN) -> J2-15 (COL LVL SW SIG)
-------------------------------------------------------------------------------------------
The wire list below is UNUSED in the manual controls, but the module does have a pin in that location,
UNPLUG this wire just in case.
--J3-3 (PU) RECIRC DR PSN SIG
-------------------------------------------------------------------------------------------
Unpopulated pins shown. J4 pin 1 and 9 are hidden, they are vacant.
Other than a faulty control unit resulting in multiple follow-up posts, there are no current issues.
Big "THANK YOU!" to everyone who helped out!
Last edited:
