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indicator relay


mc

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Don’t think it’s got one. I believe a unit called the BCM (Body control Module) takes the turn signal info from the indicator stalk on the wheel and powers the indicator lamps itself. I also believe the clicking indicator sound is also controlled by the BCM which powers an audible sounder from one of its outputs.

If that’s not the right answer it does sound quite good. No doubt someone will put us both right on the subject.

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System Description AKS000UC

 

TURN SIGNAL OPERATION

 

When the ignition switch is in the ON or START position, power is supplied

 

through 10A fuse [No. 1, located in the fuse block (J/B)]

 

to BCM (body control module) terminal 35, and

 

through 10A fuse [No. 14, located in the fuse block (J/B)]

 

to terminal 23 of the combination meter.

 

Ground is supplied

 

to BCM (body control module) terminal 8

 

through grounds E17, E43, and F152, and

 

to combination meter terminals 10, 11 and 12

 

through grounds M30 and M66.

 

LH Turn

 

When the turn signal switch (combination switch) is moved to the LH position, the BCM (body control module)

 

receives left turn signal by combination switch reading function (Refer to LT-159, "Combination Switch Reading

 

Function" ). Power is supplied

 

through BCM (body control module) terminal 22

 

to front turn signal lamp LH (part of the front combination lamp LH) terminal 2 (with xenon headlamp)

 

to front turn signal lamp LH (part of the front combination lamp LH) terminal 1 (with halogen headlamp)

 

to rear turn signal lamp LH (part of the rear combination lamp LH) terminal 2.

 

Ground is supplied to the front turn signal lamp LH (part of the front combination lamp LH) terminal 1 through

 

grounds E17, E43 and F152 (with xenon headlamp).

 

Ground is supplied to the front turn signal lamp LH (part of the front combination lamp LH) terminal 4 through

 

grounds E17, E43 and F152 (with halogen headlamp).

 

Ground is supplied to the rear turn signal lamp LH (part of the rear combination lamp LH) terminal 4 through

 

grounds T14, B6, B5 and D105.

 

The BCM also supplies ground to unified meter and A/C amp terminals 1and 11 across the CAN communication

 

lines. This input signal is processed by the unified meter control unit in the combination meter through the

 

unified meter and A/C amp, which in turn supplies ground to the left turn signal indicator lamp.

 

With power and ground supplied, the BCM controls the flashing of the LH turn signal lamps.

 

RH Turn

 

When the turn signal switch (combination switch) is moved to the RH position, the BCM (body control module)

 

receives right turn signal by combination switch reading function (Refer to LT-159, "Combination Switch Reading

 

Function" ) power is supplied

 

through BCM (body control module) terminal 21

 

to front turn signal lamp RH (part of the front combination lamp RH) terminal 2 (with xenon headlamp)

 

to front turn signal lamp RH (part of the front combination lamp RH) terminal 1 (with halogen headlamp)

 

to rear turn signal lamp RH (part of the rear combination lamp RH) terminal 2.

 

Ground is supplied to the front turn signal lamp RH (part of the front combination lamp RH) terminal 1 through

 

grounds E17, E43 and F152 (with xenon headlamp).

 

Ground is supplied to the front turn signal lamp RH (part of the front combination lamp RH) terminal 4 through

 

grounds E17, E43 and F152 (with halogen headlamp).

 

Ground is supplied to the rear turn signal lamp RH (part of the rear combination lamp RH) terminal 4 through y

 

grounds T14, B6, B5 and D105.

 

The BCM also supplies ground to unified meter and A/C amp terminals 1 and 11 across the CAN communication

 

lines. This input is processed by the unified meter control unit in the combination meter through the unified

 

meter and A/C amp, which in turn supplies ground to the right turn signal indicator lamp.

 

With power and ground supplied, the BCM controls the flashing of the RH turn signal lamps.

 

HAZARD LAMP OPERATION

 

Power is supplied at all times

 

to BCM (body control module) terminal 7

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Thanks for the replies, I was going to change the indicator bulbs to LEDs but then change the relay to get the correct flashing speed... looks a little more complicated now! :headhurt:

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