Relay
T21 of B45 supplies the circuit
for the sun roof, via coupling D45 pin 1, whilst pin 2 of D45 is
earthed through the line protected by fuse F55 of junction unit
B45.
The energizing controlled by the ignition
(INT/A) for relay
T21 arrives via relay T8 of engine compartment
junction unit B1 and fuse F3 of junction unit B2.